…e actions

- Add downloads tab to footer pane (journal | downloads tabs)
- Auto-expand footer + switch to downloads on hal0:pull-started event
- Download rows with state indicators (running/queued/completed/failed/cancelled)
- Progress bar with speed/ETA for running downloads
- Cancel/retry/clear actions per download state
- Empty state with link to models page
- usePullsList hook: polls GET /api/models/pulls every 2s
- useClearPullJob hook: DELETE /api/models/pulls/{id}
- New endpoints: pulls, pullsDelete
- CSS: foot-tabs, foot-tab, foot-downloads, foot-dl-row, foot-dl-state, foot-dl-bar, foot-dl-empty
- Animated spinner for running state
- Backend: GET /api/models/pulls, DELETE /api/models/pulls/{id} routes
- Backend: PullJob registry model with state tracking

…_persisted_jobs(), pull-started event

- Added GET /api/models/pulls endpoint: returns all pull jobs (active in-memory +
  persisted terminal from disk). Dedup: in-memory wins over disk. Entry shape
  includes model_id, job_id, state, bytes_downloaded, bytes_total, speed_bps,
  eta_s, hf_repo (from model registry), dest_path, error, started_at, finished_at.
- Added DELETE /api/models/pulls/{model_id} endpoint: clears terminal pull
  jobs from memory + disk. Returns 409 if job is still active.
- Added list_persisted_jobs() helper to src/hal0/registry/pull.py: reads all
  .json files from _pull_jobs_dir() and returns a list of dicts.
- Added usePullsList and useClearPullJob hooks in useModels.ts.
- In usePullJob, dispatch hal0:pull-started custom event when start() succeeds
  (before SSE stream), so the downloads pane can react.
- Added modelPulls and modelPullDelete to the endpoints catalogue.
- All existing tests pass, frontend builds cleanly.

- PullJob interface: snake_case fields match API response (job_id, hf_repo,
  dest_path, bytes_downloaded, bytes_total, started_at, finished_at)
- chrome.jsx: fix field references, compute pct client-side, add
  calculating… fallback when speed is 0, fix clear uses model_id
- Backend: filter persisted jobs to terminal states only, DELETE returns 204
- Review fixes: all critical spec review issues resolved

Move the documents list out of the two-column grid so it spans the
full container width, matching the other full-width sections
(operations, danger zone).  The four tool cards above it (reflect,
recall, directives, mental models) stay in a 2×2 grid with equal
heights via flex:1.

- Restructure MemToolsPanel: left column = reflect + recall,
  right column = directives + mental models
- Documents rendered as a full-width sibling below the grid
- Add .mt-col > .mt-card { flex: 1 } for equal card heights
- Add margin-top spacing for the now-sibling documents card