Performance release: removes the observer dashboard daemon's per-tick O(contracts × tree × readers) filesystem storm.

Highlights

• Walk-free load_contract — leaf-id normalization moved to write time plus an explicit idempotent heal-leaf-ids migration sweep; a contract load no longer walks the whole tasks tree.
• One shared contract snapshot per projection tick — the three per-tick readers share a single enumeration, backed by a stat-identity parse cache across ticks.
• Change-driven projection with idle heartbeat — the projector wakes on debounced coordination-input changes or a 15s heartbeat instead of unconditionally every second; the watch set never descends into worktree/container runtime, and any watch failure degrades loudly to fixed-interval ticking.

Impact

• Observer tick read cost ~750 ms → ~9 ms.
• Idle re-projections ~20 / 20s → ~3 / 20s; change latency ~1.2 s.
• Steady daemon CPU ~160% → ~7–22%.

Full mcp suite 2126 passed; repository quality wrapper green; verified against a live tree with provider containers running.