M0 — Scout context audit (testing, core slice, rules, commands)

Sub-issue of #37124. Scout half of the Rock — mirrors Jose's M0 (#37125).

Description

Inventory contradictions, orphaned files, and duplication across Fabrizzio's slice of the AI context: docs/testing/ (5 files), the docs/core/ slice, .cursor/rules/ (7 files, 453 lines) and .claude/commands/ (7 slash commands). This is the finalized fix-list that M1/M2/M3 execute against. Inventory only — no file changes.

Two areas have never been audited by anyone: .cursor/rules/ and .claude/commands/. Their last commits are all incidental (the Vitest migration, the Angular 22 upgrade, skill governance) — no one has cross-checked their content against real source the way M1–M3 did for docs/backend/.

Acceptance Criteria

• All 5 docs/testing/ files read and cross-checked — BACKEND_UNIT_TESTS.md carries fabricated content, E2E_TESTS.md is clean; see inventory part 2
  • INTEGRATION_TESTS.md excluded from re-audit — fully rewritten by Jose in #37128; its monitoring gate is tracked separately
• All .cursor/rules/*.mdc read and cross-checked against real source — findings fixed in #37590 and #37629
• All 7 .claude/commands/*.md read and cross-checked against real source — finding fixed in #37610
• docs/core/ slice files read and cross-checked
• Contradictions confirmed with exact file:line citations, not just "seems off" — for everything audited so far; docs/core/ slice still pending
• Orphaned files confirmed by verifying they're absent from both CLAUDE.md's navigation and docs/README.md — 7 found, see inventory comment
• Duplication candidates confirmed or ruled out by reading full file content — API_TESTING.md and PERFORMANCE_TESTS.md both read in full and ruled out
• Findings published as a structured inventory (in comments)

Two ownership questions to close in this milestone

• The docs/core/ slice doesn't add up. The split gives Jose 4 files (ARCHITECTURE_OVERVIEW.md, SECURITY_PRINCIPLES.md, ROLLBACK_UNSAFE_CATEGORIES.md, CODE_STRUCTURE.md — the last one now folded into ARCHITECTURE_OVERVIEW.md by #37128) and Fabrizzio 5. After Jose's 3 surviving files, 6 remain: CICD_PIPELINE.md, GITHUB_ISSUE_MANAGEMENT.md, GIT_WORKFLOWS.md, PROGRESSIVE_ENHANCEMENT.md, SDK_BREAKING_CHANGE_CATEGORIES.md, SPEC_KIT_QUICK_START.md. One file is unassigned — decide which, or widen the slice to 6.
• Four directories belong to no one. docs/cli/ (CLI_OVERVIEW.md, CLI_BUILD_SYSTEM.md — 25 KB combined), docs/claude/GPG_COMMIT_SIGNING.md and docs/test-cases/README.md are all orphaned and claimed by neither Falcon nor Scout. Same gap the Rock already hit with docs/integration/ and resolved as joint ownership in #37129 — needs the same kind of decision, not just a doc fix.

Priority

High