Docs: sweep for accuracy after 0.18

[sdeken]

A documentation sweep after 0.18.0. Every document was checked against the code and rewritten or corrected where it had drifted. Time tracking now lives in devlog-time (the app has no Tracker), storage is format 4, blocks form a tree that opens as pages, and canvases have node types. The docs also now cover extension API 1.7, the Timesheet and Summary as extension pages, and destinations reached through the app.

Rewritten

• docs/EXTENSIONS.md: now a reference for the model as built. It covers the manifest, the lockfile, consent/grants/trust, settings and secrets, the sandbox limits, and what an extension can do by topic, with API version tags. It ends with a list of what is not built yet.
• docs/TIME-EXTENSION.md: describes the finished state. It has a table of what belongs to devlog-time versus the app, what each API version (1.5–1.7) added, the data layout, and hour targets.
• docs/DESIGN.md:
  • Process model and storage layout: format 4, devlog.lock.json, extensions/<id>/, and todos.md removed.
  • Blocks as a tree and canvases with node types.
  • The time and activity-log section now describes devlog-time plus the main process's machine state. The activity log is written only while an extension provides time.
  • Also updated: review, auto-update, the editor, and sync. A short new Extensions section points to EXTENSIONS.md.

Corrected

• docs/TIMESHEETS.md, docs/BLOCK-PAGES.md, README.md: UI names, shortcuts, the repository layout, the Summary as a page, and the release procedure.
• packages/core/README.md, packages/extension-api/README.md: the API table now covers everything up to 1.7 and the testing section lists the harness helpers. builtin-extensions/README.md and the devlog-focus manifest description are also corrected.
• Code comments in packages/core/src/node/manifest.ts and packages/core/src/format/canvases.ts that still said storage format 3.

Not only docs

• package.json: package, package:mac, package:win, package:linux and screens now run npm run build instead of electron-vite build. Before, packaging from a fresh clone skipped bundling the built-in extensions. CI already ran npm run build and is unaffected.
• The hour-targets example in docs/TIME-EXTENSION.md and tests/devlog-time.test.ts now uses a made-up client name.

Checks

• npm run typecheck passes.
• npx vitest run: all 231 tests pass.

🤖 Generated with Claude Code

https://claude.ai/code/session_01CAgWUf68JDhC5YPtWj1zT6

---

Generated by Claude Code