feat(dashboards): v2.7 widget catalog — file-reading widgets, sparkline, typed status, project-wide watch

Major project-dashboard release. Five new widget types (markdown_file, log_tail,
cron_status, image, status_grid), inline sparkline on stat, typed status enum
shared by list + status_grid, structured WidgetErrorCard, and a project-wide
.scarf/ directory watch that picks up files cron jobs write next to dashboard.json.

- ProjectDashboard: extend DashboardWidget with path/lines/jobId/cells/gridColumns/sparkline; add StatusGridCell + ListItemStatus (lenient parse with synonyms)
- HermesFileWatcher: watch each project's .scarf/ dir alongside dashboard.json (local FSEvents + remote SSH mtime poll); updateProjectWatches signature now takes dashboardPaths + scarfDirs
- New widget views: CronStatus, Image, LogTail, MarkdownFile, StatusGrid, plus WidgetErrorCard for structured failure messaging; legacy "Unknown" placeholder replaced everywhere
- WidgetPathResolver: project-root-anchored path resolution that rejects absolute paths + ".." escapes pre and post canonicalization
- Stat widget gains optional inline sparkline (pure SwiftUI Path, no Charts dep); list widget rows route through typed status with semantic icons + ScarfColor tints
- iOS list widget + unsupported card adopt typed status + warning-toned error card (parity with Mac error styling); new widget types remain Mac-only
- Site mirror: widgets.js renders all five new types (file-reading widgets show annotated catalog placeholders), sparkline SVG, status-grid grid; styles.css adds typed-status palette + error-card + sparkline + grid styles
- Catalog validator: tools/widget-schema.json is the single source of truth; build-catalog.py loads it and enforces per-type required fields. 8 new test cases in test_build_catalog.py covering schema load, v2.7 additions, and missing-required rejection
- Template-author skill (SKILL.md) gains v2.7 Widget Catalog section + canonical status guidance; CONTRIBUTING.md points authors at widget-schema.json; template-author bundle rebuilt
- Localizable.xcstrings picks up auto-extracted strings for the previously-shipped OAuth keepalive feature
- Release notes drafted at releases/v2.7.0/RELEASE_NOTES.md

Backwards compatible — existing dashboard.json renders byte-identically, status synonyms (ok/up/down/active/etc.) keep working.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

templates/CONTRIBUTING.md

@@ -67,7 +67,7 @@ Minimum required files under `staging/`:
 
 - **`AGENTS.md`** — the cross-agent spec. Include: project layout, first-run bootstrap (if any), what each cron job expects to happen, and answers to common user prompts (`"what's the status"`, `"add a X"`, etc.).
 
-- **`dashboard.json`** — the Scarf dashboard that renders on the catalog detail page and after install. See [awizemann/site-status-checker/staging/dashboard.json](awizemann/site-status-checker/staging/dashboard.json) for the schema in action.
+- **`dashboard.json`** — the Scarf dashboard that renders on the catalog detail page and after install. See [awizemann/site-status-checker/staging/dashboard.json](awizemann/site-status-checker/staging/dashboard.json) for the schema in action. The canonical widget vocabulary lives at [`tools/widget-schema.json`](../tools/widget-schema.json) — the catalog validator reads it and every widget type must appear there. **v2.7+ adds five new widget types** (`markdown_file`, `log_tail`, `cron_status`, `image`, `status_grid`) plus a `sparkline` field on `stat` and a typed status enum on `list` items (`success` / `warning` / `danger` / `info` / `pending` / `done` / `neutral`; common synonyms like `ok` / `up` / `down` also accepted). File-reading widgets (`markdown_file`, `log_tail`, `image`-with-`path`) take a `path` field relative to the project root — by convention place the underlying files inside `.scarf/` so the project-wide directory watch refreshes them automatically.
 
 Optional: