Phase 1 Workstream A+E: thesis substrate + dual-approval gate

- migration 0002_phase1_architect: thesis_lines (core spine + per-segment lines),
  thesis_nodes (+ append-only revisions), thesis_versions (one-canonical-per-line
  DB invariant), thesis_reviews (dual approval + feedback), segments. Reversible.
- backend/mcp/architect_tools.py: agent draft tools (node tree, versions,
  segments, get_canonical fails-closed) — NO self-approval path. MCP-exposed.
- backend/thesis_review.py + server.py routes: human-gated approval. Dual sign-off
  via thesis_required_approvals; atomic supersede; every action logged.
- docs/PHASE_1.md (kickoff brief); docs/OPERATIONS.md (partner guide);
  start9/0.4 "Resolve duplicate names" fuzzy action.

Verified on synthetic data: dual approval promotes correctly, exactly one
canonical survives supersede, get_canonical fails closed, full interaction_log.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

start9/0.4/startos/actions/index.ts

@@ -1,7 +1,9 @@
 import { sdk } from '../sdk'
 import { buildSearchIndex } from './buildSearchIndex'
 import { refreshSearchIndex } from './refreshSearchIndex'
+import { resolveDuplicates } from './resolveDuplicates'
 
 export const actions = sdk.Actions.of()
   .addAction(buildSearchIndex)
   .addAction(refreshSearchIndex)
+  .addAction(resolveDuplicates)