feat(reconciliation): implement deterministic state reconciliation engine and post-commit hook

- Implement ReconciliationEngine in server/src/handlers/reconciliation.rs
- Auto-transition ADRs to implemented, resolve tech debts, and cascade task unblocking
- Ingest git commit events via POST /api/git/commit and scripts/git-reconcile.py post-commit hook
- Add universal pagination, search filtering, and keyboard navigation to dashboard
- Implement non-destructive task TTL expiry sweeper and gate verification
- Implements: ADR-0102, ADR-0103

server/src/tools.rs

@@ -739,6 +739,9 @@ pub struct MilestonesTool {
     pub description: Option<String>,
     /// Optional deliverables or task checklist.
     pub deliverables: Option<Vec<String>>,
+    /// Optional list of task IDs associated with this milestone.
+    #[serde(default)]
+    pub task_ids: Option<Vec<String>>,
     /// Optional repository name.
     pub repo_name: Option<String>,
 }