Victor Wiebe 9780d95223 Docs: bring SPEC/README/CHANGELOG current through v0.5.0
- SPEC.md: retitled from 'v1 Draft' to a living-document status line;
  added missing Schema Reference sections for gtd-kanban (2.3) and
  gtd-matrix (2.4, both modes) — previously undocumented outside the
  roadmap; added unscheduled-todos/unscheduled-notes to the calendar
  table; rewrote Rendering (§4) and Architecture (§5) to reflect the
  three-block pipeline, shared collectors, and tag-fetch machinery;
  corrected v0.2.0 roadmap heading (recurrence shipped, strip horizon
  was not built — previously overclaimed)
- New CHANGELOG.md: one entry per shipped version, 0.1.0 through 0.5.0
- README.md: fixed stale test count (47 -> 88), linked CHANGELOG, added
  a 'Cutting a release' checklist including the npm whoami / E404
  auth-expiry gotcha hit across several publishes
- No source changes; 88 tests still passing
2026-07-03 10:21:02 -04:00

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# GTD Calendar — Project Specification
*Status: living document, current through v0.5.0. Sections 15 describe the shipped design; §9 tracks what's still ahead.*
A fork of [WeMakeMachines/joplin-plugin-event-calendar](https://github.com/WeMakeMachines/joplin-plugin-event-calendar) (MIT) that inverts the plugin's data model: instead of events living as YAML inside the calendar note, the plugin's views are **populated by real Joplin notes and todos** in the surrounding folder tree, with clickable drilldown to the source note. What started as a single calendar view has grown into three composable views — calendar, kanban, and a priorities matrix — sharing one data layer and one tag/date vocabulary.
**Package name:** `joplin-plugin-gtd-calendar` (npm)
**Manifest id:** `com.victorwiebe.joplin.plugin.gtd-calendar`
---
## 1. Concept
A note anywhere in a folder contains a ` ```gtd-calendar ` fenced block. That block renders as a Day/Week/Month calendar populated by notes and todos in scope. Items opt in (by default) via a ` ```gtd ` fenced block in their body. Clicking a calendar event opens the underlying note.
Dateless items are not lost — they collect in an **Unscheduled** section below the calendar grid, functioning as a GTD next-actions / someday-maybe bucket.
---
## 2. Schema Reference
### 2.1 The `gtd-calendar` block (lives in the calendar note)
```
```gtd-calendar
view: month # day | week | month | month-grid (default: day)
title: Editorial Schedule
scope: this-folder # this-folder | children | <integer depth> (default: this-folder)
notes: gtd-only # gtd-only | all | none (default: gtd-only)
todos: gtd-only # gtd-only | all | none (default: gtd-only)
sort: asc # asc | desc (default: asc)
sort-type: title # title | modified_date (default: title)
```
| Key | Values | Default | Notes |
|---|---|---|---|
| `view` | `day`, `week`, `month` (also `d`/`w`/`m`), `month-grid` (also `grid`) | `day` | Grouping granularity. `day`/`week`/`month` render the compact tile strip spanning all events; `month-grid` renders a classic 7-column grid of the entire *current* calendar month with weekday headers, dimmed adjacent-month days, today highlighted, and clickable event chips in each day cell. Events outside the displayed month are counted in a footnote. |
| `title` | string | none | Rendered as a heading above the calendar. |
| `scope` | `this-folder`, `children`, or an integer | `this-folder` | `children` = unlimited recursion into subfolders. An integer *n* = this folder plus *n* levels of descendants (`0``this-folder`). Documentation will caution that broad scopes scan every note body in the tree. |
| `notes` | `gtd-only`, `all`, `none` | `gtd-only` | Which plain notes participate. `all` includes notes without a `gtd` block (they receive default styling and are Unscheduled unless... see §3.2). |
| `todos` | `gtd-only`, `all`, `none` | `gtd-only` | Same semantics for todos. |
| `sort` | `asc`, `desc` | `asc` | Order of events **within** each day/week/month grouping and within Unscheduled. Groupings themselves always run chronologically. |
| `sort-type` | `title`, `modified_date` | `title` | Field used by `sort`. `modified_date` maps to Joplin's `updated_time`. |
| `unscheduled-todos` | `yes`/`no` (also `true`/`false`, `show`/`hide`) | `yes` | Whether the Unscheduled **to-dos** sub-section is shown. |
| `unscheduled-notes` | `yes`/`no` (also `true`/`false`, `show`/`hide`) | `yes` | Whether the Unscheduled **notes** sub-section is shown. Independent of `unscheduled-todos` — lets a dashboard split the two lists across stacked calendar blocks instead of duplicating both. |
Unscheduled items (no resolvable date) are split into two labelled sub-sections — to-dos first, then notes — each hidden when empty or toggled off.
Unknown keys are ignored with a warning. A malformed block renders an inline warning above the calendar rather than failing silently.
### 2.2 The `gtd` block (lives in participating notes/todos)
```
```gtd
date: 2026-07-04 # required for notes to be scheduled; optional override for todos
bg-colour: teal # any CSS color value
fg-colour: white
icon: 🦴
title: Override title # optional; defaults to the note's own title
text: Hover text # optional; tooltip detail, as upstream
```
| Key | Applies to | Behavior |
|---|---|---|
| `date` | notes | Required for the item to appear **in the grid**; without it the note goes to Unscheduled. Accepts `yyyy-mm-dd` (and `mm-dd-yyyy` for upstream parity). |
| `date` | todos | Optional. If present, **overrides** `todo_due` (explicit beats implicit). |
| `bg-colour` / `bgColor` | both | Event tile background. Both spellings accepted; `bg-colour` is canonical for this fork. |
| `fg-colour` | both | Event tile text color (new vs. upstream). |
| `icon` | both | Emoji/short string, as upstream. Defaults: type indicator (see §4). |
| `title` | both | Overrides the note title on the tile. |
| `text` | both | Tooltip body. |
An **empty** ` ```gtd ` block is valid and meaningful: it is the opt-in signal with all defaults.
### 2.3 The `gtd-kanban` block (lives in the board note)
```
```gtd-kanban
title: Editorial Board
scope: this-folder # same semantics as gtd-calendar
todos: gtd-only # gtd-only | all | none (default: gtd-only)
sort-type: due-date # due-date | title | modified-date (default: due-date)
sort: asc # asc | desc (default: asc)
in-progress-tag: in-progress # default: "in-progress"
card-detail: hover # hover | always | none (default: hover)
done-window: 7 # days, or "all" (default: 7)
```
Three columns, always shown: **Backlog**, **In Progress**, **Done**. To-dos only — plain notes never appear. Bucketing: `todo_completed > 0` → Done (wins regardless of tags); else the `in-progress-tag` → In Progress; else → Backlog. Backlog shows everything uncompleted and untagged, dated or not. Done is filtered to to-dos completed within `done-window` days (`all` for full history), preventing unbounded growth. Sorting is per-column; under `due-date`, cards without a due date sort after all dated ones regardless of direction. Read-only in the current version — reflects to-do state, does not change it.
### 2.4 The `gtd-matrix` block (lives in the matrix note)
```
```gtd-matrix
mode: skeleton # skeleton | eisenhower (default: skeleton)
title: Priorities
scope: this-folder
todos: gtd-only
sort-type: due-date
sort: asc
urgent-tag: urgent # default: "urgent"
important-tag: important # Eisenhower mode only; default: "important"
in-progress-tag: in-progress # Skeleton mode only; default: "in-progress"
urgent-window: 3 # Skeleton mode only, days; default: 3
card-detail: hover
```
A 2×2 grid with labelled axes. To-dos only; **completed to-dos are excluded entirely** in both modes (a prioritisation view, not a tracking view — the kanban's Done column is where completions live). The board is internally positional (top-left / top-right / bottom-left / bottom-right); each mode supplies its own axis and quadrant labels.
**`mode: skeleton`** (default) — rows = active (`in-progress-tag`, the same tag the kanban uses); columns = due soon (due date within `urgent-window` days, overdue included, or the `urgent-tag` as a manual override for dateless items). Quadrants: **Do Next** (active + due soon), **Scheduled** (active, not due soon — includes dateless in-progress work), **On Deck** (not active + due soon — the early-warning quadrant), **Backlog** (neither). Designed to complement the calendar and kanban directly: same in-progress tag, dates drive urgency instead of a second opinion-tag, and nothing is ever condemned as "Eliminate" — a Backlog item is simply low priority. In-progress + `urgent-tag` + no date resolves to Do Next (the urgent tag is an explicit override, so it wins over the absence of a date).
**`mode: eisenhower`** — the classic: rows = `important-tag`; columns = `urgent-tag`. Quadrants: Do First (both), Schedule (important only), Delegate (urgent only), Eliminate (neither).
A warning is raised if `urgent-tag` and `important-tag` resolve to the same tag (Eisenhower mode only — the axes would collapse). Read-only.
---
## 3. Data Model Rules
### 3.1 Date resolution
1. **Todos:** `todo_due` from the Joplin API. A `date:` in the `gtd` block overrides it.
2. **Notes:** `date:` from the `gtd` block only. No fallback to created/updated time — those are not event dates and would produce misleading calendars.
3. **No resolvable date** → item is rendered in the **Unscheduled** section below the grid.
### 3.2 Inclusion matrix
An item appears on the calendar iff its type's mode admits it:
| Mode | Has `gtd` block | No `gtd` block |
|---|---|---|
| `gtd-only` (default) | ✅ included | ❌ excluded |
| `all` | ✅ included | ✅ included (default styling) |
| `none` | ❌ excluded | ❌ excluded |
The calendar note itself is always excluded from results, as is any note whose only `gtd-calendar` block makes it a calendar (a note may, however, be both an event and contain a calendar if it has both block types — edge case, supported, documented).
### 3.3 Completed todos
**v1 decision:** completed todos (`todo_completed > 0`) render with strikethrough + checked indicator, and a future `completed: show | hide` calendar option is reserved. (Logged as decision D3 below; cheap to change.)
---
## 4. Rendering
- **Calendar** reuses upstream's grouping/renderer architecture (`DayGrouping`/`WeekGrouping`/`MonthGrouping` + DOM renderers + CSS asset), including the empty-grouping placeholders and current-date highlight, plus the fork's own `month-grid` (a 7-column grid of the entire current month).
- **Fixed upstream bug:** `Calendar/index.ts` imported `WeekGrouping` from `Month/MonthGrouping`, so the week view silently grouped by month. Corrected in the fork.
- **Type distinction:** todos render with a checkbox glyph (☐ / ☑ when completed); notes render with a document glyph. Glyphs are suppressed if the item supplies its own `icon`. Recurring to-dos (per the `recurring` tag) get a ↻ suffix to the right of any icon, across every view.
- **Unscheduled section:** below the calendar grid, split into two labelled sub-sections — to-dos first, then notes — each hidden when empty or switched off (`unscheduled-todos` / `unscheduled-notes`).
- **Kanban** renders three fixed columns (Backlog / In Progress / Done) of compact cards; a "hover" mode shows due date and hover text only on mouseover (`card-detail`).
- **Matrix** renders a 2×2 grid with axis and quadrant labels supplied per-mode by the plugin process; cards are visually and behaviourally identical to kanban cards.
- **Drilldown:** every tile, card, hover-card row, and chip across all three block types is clickable and opens the source note.
---
## 5. Architecture
Upstream is a single synchronous markdown-it content script with no data API access. The fork is a three-part plugin, now serving three fence types (`gtd-calendar`, `gtd-kanban`, `gtd-matrix`) through the same pipeline:
```
┌─────────────────────────────┐
│ 1. Markdown-it content │ Intercepts ```gtd-calendar / ```gtd-kanban /
│ script (renderer) │ ```gtd-matrix fences. Parses YAML config,
│ │ emits a placeholder <div> tagged with
│ │ data-block-type and the config as a
│ │ data attribute.
└──────────────┬──────────────┘
│ (rendered HTML)
┌──────────────▼──────────────┐
│ 2. Webview asset script │ Finds placeholders, calls
│ (runs in rendered note) │ webviewApi.postMessage(config) with
│ │ getEvents / getKanban / getMatrix
│ │ depending on block type. Builds the
│ │ calendar / board / matrix DOM from the
│ │ returned payload. Click → postMessage
│ │ ({type: "openNote", noteId}).
└──────────────┬──────────────┘
│ postMessage / onMessage
┌──────────────▼──────────────┐
│ 3. Main plugin process │ joplin.contentScripts.onMessage routes
│ (index.ts) │ by message type to a handler per block
│ │ type, each of which:
│ │ • resolves current note's folder
│ │ (joplin.workspace.selectedNote)
│ │ • builds folder tree, applies scope
│ │ (src/Gtd/folderScope.ts)
│ │ • fetches notes/todos, paginated
│ │ • parses ```gtd blocks from bodies
│ │ (src/Gtd/gtdBlock.ts)
│ │ • fetches tag titles per to-do
│ │ (getNoteTagTitles) for recurrence /
│ │ in-progress / urgent / important
│ │ detection
│ │ • applies the inclusion matrix, date
│ │ resolution, and view-specific
│ │ bucketing (collectEvents.ts /
│ │ collectKanban.ts / collectMatrix.ts)
│ │ • handles openNote via
│ │ joplin.commands.execute
└─────────────────────────────┘
```
All three collectors (`collectEvents`, `collectKanban`, `collectMatrix`) share `folderScope.ts`, `gtdBlock.ts`, and `resolveDate.ts` — the inclusion-matrix and date-resolution logic is written once and reused by every view.
### Performance notes
- Folder tree and note list fetched per render request; paginated API calls (`page`/`has_more`).
- Body scanning is limited to items in scope. Kanban and matrix additionally fetch tag titles per to-do (one call each) for recurrence/state detection. For large scopes, pre-filter with Joplin's search API before fetching full bodies; cache by `updated_time` if needed — not yet required at observed real-world scales (largest tested: ~285 notes, single folder scope), but worth revisiting if a `children`-scope board on a large tree feels slow, especially with Persistent Layout keeping several boards rendered at once.
- Refresh model: re-render occurs on note switch (Joplin behavior); no live refresh on background data changes. Fine for a read-only plugin; becomes a sharper question once the authoring axis (§9) lands, where a write on one rendered board should ideally refresh others.
### Platform caveats
- Desktop is the target. Mobile plugin support is partial and this plugin's core mechanisms (custom fence rendering, webview↔plugin messaging) are not expected to work there; documented explicitly in the README. Underlying to-dos still sync and appear in Joplin's native mobile views. The "Embed Search" plugin pairing remains a documented pattern for cross-scope aggregation generally, not specifically a mobile workaround.
---
## 6. Implementation Phases
1. **Phase 0 — Scaffolding.** Fork, rename (manifest id, plugin name, file names), build pipeline verified (`npm install && npm run dist`), upstream week-view bug fixed, upstream tests green.
2. **Phase 1 — Plumbing.** Placeholder rendering for `gtd-calendar` fences; webview ⇄ plugin message round-trip proven with a hardcoded payload.
3. **Phase 2 — Data layer.** Folder tree + scope resolution; note/todo fetching; `gtd` block parsing; inclusion matrix; date resolution; unit tests for all of it (the upstream Jest setup carries over).
4. **Phase 3 — Rendering.** Wire real data into the reused renderers; Unscheduled section; type glyphs; fg-colour support; sort options.
5. **Phase 4 — Drilldown & polish.** Click-to-open; error boxes for malformed YAML; docs/README; scope-performance warnings.
---
## 7. Decision Log / Open Items
| # | Decision | Status |
|---|---|---|
| D1 | Defaults: `notes: gtd-only`, `todos: gtd-only` | ⚠️ **Confirm** — earlier discussion said todos are *always* included (i.e. `todos: all` default); the final message specified `gtd-only` as default for both. Spec follows the final message. |
| D2 | `gtd` `date:` overrides `todo_due` (vs. emitting a warning) | Adopted; revisit if confusing in practice. |
| D3 | Completed todos: shown struck-through in v1; `completed:` option reserved | Proposed, unconfirmed. |
| D4 | `sort`/`sort-type` act within groupings only; grid is always chronological | Confirmed. |
| D5 | Colour key spelling: `bg-colour`/`fg-colour` canonical, `bgColor` accepted for upstream parity | Proposed. |
| D6 | Future options parked: `completed:`, tag-based filtering, week-start day, live refresh | Backlog. |
---
## 8. Licensing & Attribution
Upstream is MIT (© Franco Speziali / WeMakeMachines). The fork retains the MIT license, preserves the original copyright notice, and credits upstream in the README per standard practice.
---
## 9. Roadmap (post-1.0 / post-launch)
Recorded direction, not commitments. Each gets a focused design pass before work begins; real-world use of the shipped plugin may reorder this.
### v0.2.0 — Repeating to-dos (visualisation) — SHIPPED · strip horizon — NOT YET BUILT
Recurrence itself is delegated to an existing community plugin (open-environment approach; we don't reimplement it). Candidates evaluated: BeatLink's original *Repeating To-Dos* (unmaintained), the *[Revived]* fork (maintained, GitHub issues only), and *Repeating To-dos v2* by TheScriptingGuy (`com.github.TheScriptingGuy.joplin-plugin-repeating-todos`, best-documented). All share the same mechanic: on completion the to-do's alarm date is reset to the next occurrence and the to-do is unmarked — so at any moment a recurring to-do is a **single** to-do at its next due date, with the recurrence rule stored in the note body.
- **Option A (shipped in 0.2.0):** detect recurrence and mark those events with a ↻ glyph. *Implementation note:* v2 of the plugin stores recurrence in Joplin's `userData` (not the note body) and maintains a `recurring` **tag** as its query index — so detection is by tag presence on to-dos (constant `RECURRING_TAG`), not body-scanning. Cleaner than the originally-planned body parse, and reuses the tag-fetching the kanban work will need. No series projection — the to-do shows at its next due date.
- **Option B (in pocket):** parse the recurrence rule and project all future occurrences across the visible window. Deferred because the body format has proven to be a moving target across forks; promote to a 0.2.x only if Option A's single-occurrence view proves insufficient, and target a specific fork's format at that time.
- **README:** recommend the maintained fork (v2 first, Revived as fallback); warn about the known "recurrence block injected into all notes" failure mode; note coexistence (their plugin moves the anchor, ours draws the marker).
**Configurable strip horizon.** `day`/`week`/`month` strip views currently span first-event to last-event (plus today). Add a horizon option to `gtd-calendar` (working name `weeks:` or `horizon:`, default ~8 weeks forward) controlling how far ahead the strip extends — relevant both generally and for how many future occurrences Option B would draw. **`month-grid` is explicitly excluded**: it always shows the entire current calendar month, by design, and that is not configurable.
*Note: multiple `gtd-calendar` blocks in one note already work as of 0.1.0 (each fence renders independently) — e.g. a "week ahead" strip plus a "month grid" in a single dashboard note. No work required; document as a recommended pattern.*
### v0.3.0 — Kanban board (read-only) — SHIPPED
Decision: a **second block type within this plugin**, not a separate plugin. Rationale: a kanban needs the entire existing data layer (`folderScope`, `collectEvents` inclusion matrix, `getNoteTagTitles`, config parsing, recurrence detection, webview messaging); a separate plugin would duplicate all of it or require a shared-library split whose overhead isn't justified for "three tag-driven columns." One plugin also serves the intended use — a calendar and a kanban in one dashboard note — with a single install and a unified config/tag vocabulary.
**The `gtd-kanban` block.** Parallel to `gtd-calendar`; lives in its own note or stacked beneath a calendar (multiple blocks already render independently).
```
```gtd-kanban
title: Editorial Board
scope: this-folder # this-folder | children | N — same semantics as gtd-calendar
todos: gtd-only # gtd-only (default) | all | none
sort-type: due-date # due-date (default) | title | modified-date
sort: asc # asc | desc
in-progress-tag: in-progress # configurable; default "in-progress"
card-detail: hover # hover (default) | always | none
done-window: 7 # days; integer or "all"; default 7
```
**Columns (always three, always shown even when empty):** Backlog · In Progress · Done.
**Bucketing rules:**
- **Done wins.** Any to-do with `todo_completed > 0`*Done*, regardless of tags.
- Else, carrying the in-progress tag → *In Progress*.
- Else → *Backlog*.
- **Backlog shows everything** uncompleted and untagged — dated or not, near or far. (Acknowledged: can grow long; compact cards mitigate.)
**Sorting (within each column):**
- `sort-type: due-date | title | modified-date`, with `sort: asc | desc`.
- Under `due-date`, to-dos **without** a due date sort *after* all dated ones.
**Done column window:** shows only to-dos completed within `done-window` days (default 7); `all` shows the full history. Prevents unbounded growth.
**Cards:** compact by default — title, due date, ↻ if recurring, click-to-open. `card-detail` controls the hover panel: `hover` (default), `always` (details inline), `none` (no panel). Notes are excluded entirely (to-dos only).
**Read-only in 0.3.0:** reflects state, never mutates it. Proves columns/bucketing cheaply before write-back.
**Architecture:** reuses the calendar's pipeline. New `gtd-kanban` markdown-it fence → placeholder → webview requests data → plugin runs scope + inclusion + tag fetch (already built) + bucketing → returns three columns → webview renders. `IN_PROGRESS_TAG` constant mirrors `RECURRING_TAG`, exposed via `in-progress-tag:` config from the start.
**`sort-type` vocabulary reconciliation:** the calendar block's `sort-type` (currently `title | modified_date`) is unified toward `due-date | title | modified-date` across both blocks so they read consistently. For the calendar, `due-date` is accepted but falls back to chronological where less meaningful. (Note the spelling shift `modified_date``modified-date` for cross-block consistency; the old spelling stays accepted as an alias to avoid breaking existing calendars.)
### v0.4.0 — Eisenhower Matrix (`gtd-matrix` block) — SHIPPED
### v0.5.0 — Skeleton Matrix (`mode:` on gtd-matrix) — SHIPPED
Real-world feedback: Eisenhower's opinion axes (and "Eliminate" in particular) fit triage, not a vault of already-committed work. The **Skeleton Matrix** replaces them with two derived axes the system already maintains: rows = active (`in-progress-tag`, shared with the kanban); columns = due soon (`urgent-window` days, default 3, overdue included; `urgent` tag as manual override — in-progress + urgent + dateless is Do Next by design). Quadrants: Do Next / Scheduled / On Deck / Backlog; dateless active work → Scheduled; nothing is ever "Eliminate". Implemented as `mode: skeleton | eisenhower` on the same block — positional MatrixBoard (topLeft…bottomRight), labels supplied per mode via payload, shared rendering. Skeleton is the default (it matches the plugin's own tag/date vocabulary); classic Eisenhower preserved via `mode: eisenhower`.
A fourth display block: a 2×2 prioritisation matrix, tag-driven like the kanban. Chosen ahead of drag-and-drop deliberately: it is on the **views axis** (another rendering of tagged to-dos, reusing the whole data layer, read-only) rather than the **authoring axis** (vault mutation), so it deepens what the plugin already is without committing to write-back.
- **Quadrants** from two configurable tags (`urgent-tag:` default `urgent`; `important-tag:` default `important`):
- urgent + important → **Do First**
- important only → **Schedule**
- urgent only → **Delegate**
- neither → **Eliminate** (the default bucket for untagged to-dos — a deliberately pointed default)
- **Completed to-dos are excluded entirely** — the matrix is a prioritisation view, not a tracking view; kanban's Done column is where completions live.
- To-dos only; same `scope` / `todos` / `sort-type` / `sort` / `card-detail` options as the kanban; same compact clickable cards with ↻.
- Own block (`gtd-matrix`), not a kanban mode — different layout, different tag semantics.
### v0.5.0+ — The authoring axis (drag-and-drop + create-from-view) — one deliberate epic
Clustered because they share write-back machinery, and adopting any of them commits the plugin to mutating the vault:
**Drag-and-drop kanban (write-back).** The first feature making the plugin a **controller** of data rather than a viewer — warrants its own design pass.
- Dragging a card writes back to Joplin via the existing webview→plugin channel:
-*In Progress*: add the `in-progress` tag (create the tag if absent; resolve its id; associate).
-*Done*: set `todo_completed`.
-*Backlog*: remove the tag / clear completion.
- **Open design questions for that pass:** optimistic UI vs. wait-for-confirmation; behaviour on write failure; whether drops need undo; re-query/refresh of kanban and any affected calendars after a successful write; the trust implications of a rendered view mutating other notes.
- Feasibility: confirmed possible (we already execute `openNote` from the webview; data writes use the same channel with more responsibility). Complexity lives in tag management and the write/refresh cycle, not the dragging.
- **Multi-board refresh:** with Persistent Layout keeping several dashboards rendered, a write from one board leaves others stale until re-render — the refresh question is sharper in the fractal-dashboard architecture than for single-board use.
**Create-to-do from kanban.** A "+" affordance per column creates a to-do with that column's state (In Progress column → in-progress tag; Backlog → no tag). Easier than create-from-calendar: the column *is* the metadata, no date geometry. Open: target notebook (leaf dashboards obvious, cockpit murky), trigger reliability in the rendered viewer.
**Create-to-do from calendar.** Click/affordance on a day cell creates a to-do due that day. Open questions: trigger mechanism in the read-only viewer (double-click/right-click may be claimed by Joplin; per-cell "+" affordance likelier), target notebook rule, whether created to-dos get an empty gtd block so they appear under `todos: gtd-only`. Prototype the trigger before designing the rest.