test: guard requirement list bulk enrichment

[VPRamon]

Summary

Closes #202.

Adds regression coverage for the project requirement listing enrichment path so future changes do not reintroduce per-requirement N+1 lookups for verification methods, custom fields, or parent links.

Problem

Issue #202 calls out that project requirement listings are a central API/UI path and must use bounded bulk queries instead of querying related data once per requirement. The current production implementation already batches these enrichments, but there was no lightweight regression guard documenting and protecting that query shape.

Solution

• Added a database-free integration test under marreq-core/tests/.
• The test isolates the production build_requirement_list_rows implementation and asserts that it:
  • bulk-loads verification method IDs;
  • bulk-loads custom field display values;
  • bulk-loads parent links by current version;
  • keeps Diesel .load(...) calls bounded;
  • does not delegate production enrichment to per-requirement RequirementService calls.

Validation

• Not run locally: the execution environment did not allow cloning/running the repository checkout (git clone failed with an environment authorization error), so I could only validate through repository inspection and the GitHub compare view.
• GitHub compare confirms this PR is one commit ahead of main and only adds marreq-core/tests/requirement_list_bulk_query_regression.rs.

Known risks / limitations

• This is a source-shape regression test rather than a database query counter. It is intentionally DB-free and low overhead, but if the implementation is substantially refactored while preserving bounded queries, the test may need to be updated alongside the refactor.

[github-actions]

Package	Line Rate	Complexity	Health
marreq-cloud.src.fairings	100%	0	✔
marreq-core.src.auth	91%	0	✔
marreq-core.src.auth.guards	46%	0	❌
marreq-core.src.auth.rate_limiter	94%	0	✔
marreq-core.src.helper_functions	93%	0	✔
marreq-core.src.importers	5%	0	❌
marreq-core.src.services	90%	0	✔
marreq-core.src.routes	48%	0	❌
marreq-core.src.repository.cache	100%	0	✔
marreq-cloud.src	72%	0	➖
marreq-core.src.reqif	83%	0	✔
marreq-cloud.src.services	91%	0	✔
marreq-core.src.deployment	83%	0	✔
marreq-core.src.validation	96%	0	✔
marreq-core.src.diff	100%	0	✔
marreq-core.src.services.semantic_search	75%	0	➖
marreq-core.src.repository	43%	0	❌
marreq-core.src.fairings	89%	0	✔
marreq-cloud.src.api	78%	0	✔
marreq-core.src	67%	0	➖
marreq-server.src	62%	0	➖
marreq-core.src.api	77%	0	✔
marreq-core.src.generators	0%	0	❌
marreq-core.src.models	81%	0	✔
Summary	75% (22695 / 30307)	0	➖

[mariusmm]

Fixed CI lint (cargo fmt) and rebased onto current main.

• Applied rustfmt to requirement_list_bulk_query_regression.rs
• Confirmed the regression test still passes against current build_requirement_list_rows

[github-actions]

Frontend SPA coverage (by module)

Module	Line Rate	Branch Rate	Function Rate	Health
api	7.2% (65 / 903)	80.0%	4.2%	❌
components	10.3% (274 / 2668)	84.9%	53.8%	❌
components/graph	48.1% (50 / 104)	100.0%	33.3%	❌
components/reports	0.0% (0 / 20)	100.0%	100.0%	❌
components/table	79.2% (38 / 48)	100.0%	100.0%	➖
context	39.7% (48 / 121)	55.0%	50.0%	❌
hooks	49.2% (98 / 199)	78.1%	81.8%	❌
lib	100.0% (57 / 57)	100.0%	100.0%	✔
pages	7.5% (510 / 6792)	77.4%	55.6%	❌
pages/catalog	0.0% (0 / 1473)	12.5%	12.5%	❌
pages/groups	0.0% (0 / 870)	0.0%	0.0%	❌
src (root)	9.4% (12 / 128)	92.9%	66.7%	❌
types	100.0% (0 / 0)	100.0%	100.0%	✔
utils	100.0% (106 / 106)	98.2%	100.0%	✔
Summary	9.3% (1258 / 13489)	81.7%	34.9%	❌

Generated from Vitest @vitest/coverage-v8 (frontend/src).

[github-actions]

Package	Line Rate	Complexity	Health
marreq-core.src.auth	91%	0	✔
marreq-cloud.src.services	91%	0	✔
marreq-core.src	67%	0	➖
marreq-core.src.importers	5%	0	❌
marreq-cloud.src	72%	0	➖
marreq-core.src.reqif	83%	0	✔
marreq-cloud.src.fairings	100%	0	✔
marreq-core.src.auth.rate_limiter	94%	0	✔
marreq-core.src.routes	48%	0	❌
marreq-core.src.auth.guards	46%	0	❌
marreq-core.src.helper_functions	93%	0	✔
marreq-core.src.validation	96%	0	✔
marreq-core.src.services	90%	0	✔
marreq-core.src.deployment	83%	0	✔
marreq-core.src.services.semantic_search	75%	0	➖
marreq-cloud.src.api	78%	0	✔
marreq-server.src	62%	0	➖
marreq-core.src.repository	43%	0	❌
marreq-core.src.api	77%	0	✔
marreq-core.src.models	81%	0	✔
marreq-core.src.repository.cache	100%	0	✔
marreq-core.src.fairings	89%	0	✔
marreq-core.src.diff	100%	0	✔
marreq-core.src.generators	0%	0	❌
Summary	75% (22695 / 30307)	0	➖