P3.1 TaskStore trait + SQLite backend - Verification complete

Verified all acceptance criteria for task store tables 1-7:
- All CRUD operations round-trip correctly (13 integration tests pass)
- Schema version check is a single SELECT on reopen
- WAL mode + busy_timeout (5000ms) prevent concurrent write deadlocks
- Tables use efficient BLOB/TEXT types within size budget
- Idempotent migrations via CREATE TABLE IF NOT EXISTS

Implementation highlights:
- tasks.node_tasks: JSON serde_json::Value (HashMap<String, u64>)
- aliases.history: JSON array bounded by history_retention
- idempotency_cache.body_sha256: BLOB (32 raw bytes)
- jobs.claim_expires_at: heartbeat every 10s with lease expiry
- leader_lease: advisory-lock substitute for SQLite

All 7 required tables implemented and tested.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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