fix(dashboard): remove duplicative Open PRs card & make memory-consolidation display live (#26)

[rysweet]

Summary

Two surgical dashboard component fixes for issue #26.

Fix 1 — Remove the duplicative Overview "Open PRs" card

Overview → Health carried two overlapping PR cards: a plain Open PRs list and the richer Merge Readiness card. Everything Open PRs showed (number, title, URL) is a strict subset of Merge Readiness (which also reports CI rollup, base allow-list, objective merge-gate verdict, blocker reason, judge kind), so it carried no unique useful info and was removed cleanly rather than folded:

• Markup (index_html/part_00.rs) — the #open-prs-list card <div>.
• Client renderer (index_html/part_01.rs) — the block reading d.open_prs.
• Data producer (activity.rs) — the gh pr list --author @me half of the tokio::join! and the /api/activity → open_prs key (one fewer gh subprocess per Overview refresh).

Merge Readiness is now the single Overview PR surface. The separate Pull Requests → Readiness tab (/api/prs, pr_readiness.rs) and the /api/merge-readiness payload (its own independent open_prs array) are untouched. The TUI standalone "Open PRs: N" count stat is intentionally left in place (not a duplicative card).

Fix 2 — Make the memory-consolidation display live

The Last Memory Compaction statistic derived from the mtime of retired JSON snapshot files (memory_records.json / evidence_records.json) that are no longer written, so it stayed frozen while consolidation ran (~30 consolidate-memory actions / 30 min; episodic memory grew 756 → 1088 in a day). memory_metrics() now sources consolidation freshness from the live consolidate-memory OODA action stream — the same newest-first cycle-report reader the Activity tab uses (#2697) — scanning outcomes for action_kind == "consolidate-memory" (the canonical Display form persist_cycle_report writes via .to_string()):

• last_consolidation is now the newest live action timestamp (not a file mtime).
• New recent_consolidation_activity {count, last} on /api/memory reports the live stream; the Memory card renders it so it visibly advances as memory grows.
• Fails closed to null (→ "Not tracked yet") with no legacy-file or directory-mtime fallback.
• Per-type counts were already live via get_statistics().

Reconciles with the Activity/Goals live-read fixes (#2697 / #2695).

Tests (hermetic)

• activity() no longer emits open_prs; the Open PRs card/markup/renderer are gone; Merge Readiness card + fetchMergeReadiness + its own d.open_prs (from /api/merge-readiness) retained.
• last_consolidation and recent_consolidation_activity reflect injected live consolidate-memory cycle reports, advance when a newer report arrives, fail closed to null with no history, and never leak raw action text.
• Live episodic count reflects the cognitive store and grows as episodes are stored.

Notes

• Additive/surgical; no --no-verify; all pre-commit + pre-push gates green locally (fmt, clippy --release and --all-targets --all-features --locked, race-subset tests, full lib test suite: 7493 passed).
• Off latest origin/main (branch already at tip; no rebase needed).
• Docs updated: dashboard.md, index.md, new reference/dashboard-overview-health-and-live-memory.md.

Fixes #26

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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📊 Coverage Summary

Generated by cargo llvm-cov --workspace --summary-only (nightly, excluding test files)

Module	Lines	Covered	Coverage
Total	146216	121889	83.4%

_{Coverage data from CI run. Test files matching tests?/ are excluded from line counts.}