test: cover communities.rs/recall.rs untested refusal and edge branches

[t0k0sh1]

Summary

Part of #627 (issue #537 audit series item 8), covering src/api/communities.rs's community_hits and src/api/recall.rs's cross_recall/cross_targets/cross_matches.

tests/http_api/communities.rs additions:

• Manifest parse error → 409 Conflict.
• source_context mismatch (the artifact was derived from a different context) → 409 Conflict.
• check_derived_scope's Forbidden — a scoped key with a grant on the path context but not on the derived artifact context.
• MEMBERS_PER_HIT (12) truncation, flagged via members_truncated.
• A community that's searchable (passage + contains edges exist) but unlisted in the manifest's own communities array — level/parent/concept_count degrade to null rather than panicking or fabricating zeros.

tests/http_api/recall.rs (new file):

• cross_targets's upfront existence check names the FIRST missing context by request-list order when several are missing at once — the existing src/api/recall.rs unit test (cross_matches_names_a_target_that_does_not_exist) only ever names one missing target, and calls cross_matches directly rather than exercising the HTTP-level cross_targets check that runs before it.
• The mid-loop memory-bound pool cut (pool.len() >= limit * 2) still yields the exact global top-limit even when it fires before every target has folded in — a 3-context fan-out where the highest-weighted matches come from the LAST-processed context proves the cut doesn't lock in a stale, weaker candidate set from the earlier ones.

Follows #667 (resolve.rs) and #668 (promote.rs), the first two PRs in this issue's series.

Test plan

• cargo fmt
• cargo clippy --all-targets --locked -- -D warnings
• cargo nextest run --locked (552 http_api tests passed)
• cargo test --doc --locked
• Diff-scoped mutation gate: test-only diff, No mutants to filter
• Each new test run 2-3x consecutively to rule out flakiness

https://claude.ai/code/session_0198T2iKZ17g3tt2bdNq1ju8

Summary by CodeRabbit

• テスト
  • コミュニティ検索で、破損したマニフェストや権限不足、不整合時に適切なエラーが返ることを検証。
  • メンバー数上限超過時の切り詰めや、未掲載コミュニティの情報処理を検証。
  • 複数コンテキストでのリコール結果統合、存在しないコンテキストへのエラー、上限件数と総件数の整合性を検証。

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📝 Walkthrough

Walkthrough

コミュニティ検索とPOST /recallの統合テストを追加した。マニフェスト異常、権限不足、結果切り詰め、未存在コンテキストなどの分岐を検証する。

Changes

HTTP API 統合テスト

Layer / File(s)	Summary
コミュニティ検索分岐の検証 tests/http_api/communities.rs	派生アーティファクトを作成するヘルパーを追加した。マニフェスト破損とsource_context不一致で409 conflictを検証する。権限不足で403 forbiddenを検証する。メンバー数の切り詰めと、マニフェスト未掲載コミュニティのnullメタデータを検証する。
Recall API統合フローの検証 tests/http_api/main.rs, tests/http_api/recall.rs	HTTP API統合テストにrecallモジュールを追加した。複数の未存在コンテキストで、リクエスト順の最初のコンテキストを示す404 no_contextを検証する。複数コンテキストの結果統合で、上位limit件と総件数を検証する。

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 4da45

The PR only adds tests and does not change production behavior. A localized follow-up could strengthen one ordering assertion, but no actionable merge-blocking risk remains.

Possibly related issues

• t0k0sh1/taguru#627 — communities.rsとrecall.rsで指摘された未検証分岐に対するテストを追加している。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	タイトルは、communities.rs と recall.rs の未検証な拒否およびエッジ分岐をテストでカバーする主目的を明確に示しています。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@tests/http_api/communities.rs`:
- Around line 677-681: Update the assertions near hit["members"] to compare the
complete returned member-name sequence with m00 through m11 in exact weight
order, while retaining the length and members_truncated checks; this must also
verify that m12 is excluded rather than checking only the first member.

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📥 Commits

Reviewing files that changed from the base of the PR and between b7d68b5 and 4da453a.

📒 Files selected for processing (3)

• tests/http_api/communities.rs
• tests/http_api/main.rs
• tests/http_api/recall.rs