feat(agent-runtime): keep search index fresh across file writes and workspace changes

[yacosta738]

• Add post-write index sync (sync_written_path) after successful file_write
• Add content_sha256 as trust boundary in plan_candidates() for freshness
• Add regression tests for stale index detection (changed/deleted/renamed paths)
• Add hash guard test for same-size/same-mtime rewrite detection
• Add integration test proving own writes are searchable without manual rebuild
• Update workspace-index spec with REQ-WIDX-011 (freshness guard) and REQ-WIDX-012 (v1 docs)
• Archive SDD change 2026-04-05-search-index-freshness

Closes #358

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: e84364b6-6131-4b45-8eb1-de98e31e6291

📥 Commits

Reviewing files that changed from the base of the PR and between 79080e4 and b2bfffc.

📒 Files selected for processing (15)

• clients/agent-runtime/src/search/discovery.rs
• clients/agent-runtime/src/search/index.rs
• clients/agent-runtime/src/search/mod.rs
• clients/agent-runtime/src/search/sqlite.rs
• clients/agent-runtime/src/search/tests.rs
• clients/agent-runtime/src/tools/code_search.rs
• clients/agent-runtime/src/tools/file_write.rs
• openspec/changes/archive/2026-04-05-search-index-freshness/design.md
• openspec/changes/archive/2026-04-05-search-index-freshness/exploration.md
• openspec/changes/archive/2026-04-05-search-index-freshness/proposal.md
• openspec/changes/archive/2026-04-05-search-index-freshness/specs/workspace-index/spec.md
• openspec/changes/archive/2026-04-05-search-index-freshness/state.yaml
• openspec/changes/archive/2026-04-05-search-index-freshness/tasks.md
• openspec/changes/archive/2026-04-05-search-index-freshness/verify-report.md
• openspec/specs/workspace-index/spec.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/358-keep-the-search-index-fresh-across-file-writes-and-local-workspace-changes

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[github-actions]

✅ Contributor Report

User: @yacosta738
Status: Passed (12/13 metrics passed)

Metric	Description	Value	Threshold	Status
PR Merge Rate	PRs merged vs closed	89%	>= 30%	✅
Repo Quality	Repos with ≥100 stars	0	>= 0	✅
Positive Reactions	Positive reactions received	10	>= 1	✅
Negative Reactions	Negative reactions received	0	<= 5	✅
Account Age	GitHub account age	3082 days	>= 30 days	✅
Activity Consistency	Regular activity over time	108%	>= 0%	✅
Issue Engagement	Issues with community engagement	0	>= 0	✅
Code Reviews	Code reviews given to others	515	>= 0	✅
Merger Diversity	Unique maintainers who merged PRs	2	>= 0	✅
Repo History Merge Rate	Merge rate in this repo	90%	>= 0%	✅
Repo History Min PRs	Previous PRs in this repo	201	>= 0	✅
Profile Completeness	Profile richness (bio, followers)	90	>= 0	✅
Suspicious Patterns	Spam-like activity detection	1	N/A	❌

---

_{Contributor Report evaluates based on public GitHub activity. Analysis period: 2025-04-05 to 2026-04-05}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
87.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud