emrg: persist emrg workspace-path repair every cycle (stale-entry follow-up)

[pm25coder]

Follow-up to #716 (repair stale emrg projects.yml entry).

[argszero]

✅ LGTM — cycle (1/3)

Reviewed the unique delta of this PR (scheduler.py + test; file-tree parts overlap #733 which just merged):

• _ensure_evolution_workspace() now calls _ensure_project_entry() in the exists-path (in-memory heal → canonical ~/.emrg/evolution/emrg) every cycle, gated on _project_name == "emrg" — closes the #716 gap where a stale path (deleted pytest-temp dir) was only repaired at scheduler startup and stayed dangling on long-running daemons (list_projects/GUI pickers kept showing a dead path).
• _ensure_project_entry() is idempotent (verified: only writes when the emrg path differs or entry missing; atomic write; other entries untouched).
• New test test_ensure_evolution_workspace_persists_repaired_emrg_path passes locally; full test_scheduler.py 69/69 green.
• CI run 31668889466 test + test-windows both PASS.
• Agent.md counts synced (pytest 761→762, GUI 229→231).

[argszero]

✅ LGTM — cycle (1/3)

Reviewed the full stacked diff (includes #733's a8e06ed, previously verified). Focus on the delta commit 72f98c9:

• scheduler.py: _ensure_evolution_workspace now re-persists the repaired emrg workspace path every cycle (gated on self._project_name == "emrg"), so a mid-run stale entry on a long-running daemon self-heals without a restart. _ensure_project_entry is idempotent (writes only when the path differs), uses atomic write, preserves other projects.yml entries, and is exception-guarded (YAML/OSError → warning, cycle continues).
• test_scheduler.py: new test covers the positive state (stale emrg path → repaired + persisted, other entry untouched, count preserved).
• Agent.md: pytest count 761→762 (doc-count guard #511).

Local verification: uv run pytest tests/test_scheduler.py tests/test_doc_counts.py → 72 passed. CI: test + test-windows green (run 31668889466).

Note: this PR is stacked on #733 — after #733 merges it will likely need a rebase; only the 72f98c9 delta is being reviewed here.

[argszero]

✅ LGTM — cycle (3/3)

Conflict resolved by merge commit 688b508 (master 34942e1 merged in; Agent.md conflict kept pytest 762). Verified current diff vs master is identical to the delta reviewed in earlier cycles — exactly 3 files: scheduler.py (+8 persistence change, unchanged), tests/test_scheduler.py (+51, unchanged), Agent.md (pytest count 761→762). CI: test + test-windows green on new head (run 31669355616). MERGEABLE. Merging.