Audit E2E Test Coverage

Analyze the gap between E2E specifications and existing test implementations. This is a read-only command — it reports findings but does not modify any files.

Additional instructions from the user: "$ARGUMENTS". Ignore if empty.

Phase 1: Discover

1. Find all E2E_TESTS.md files by searching recursively from the project root.
2. Read the root-level spec first (docs/E2E_TESTS.md or E2E_TESTS.md) to understand project-wide testing constraints.
3. Read each package-level E2E_TESTS.md and extract:
   • All suites (H2 headings)
   • All features within each suite (H4 headings)
   • Category metadata (<!-- category: ... -->)
   • Skip metadata (<!-- skip: ... -->)
4. Find all existing E2E test files:
   • Files matching **/*.e2e.test.*
   • Files inside **/e2e/**/*.test.*
5. Read existing test files and extract:
   • Suite/group blocks — the framework's grouping construct (e.g., describe() in vitest/jest, mod tests in Rust, class in pytest) — map to suites
   • Individual test cases — the framework's test declaration (e.g., it() / test() in vitest/jest, #[test] in Rust, def test_ in pytest) — map to features
   • Skip/conditional-skip markers — the framework's mechanism for skipping tests (e.g., skip / skipIf in vitest/jest, #[ignore] in Rust, @pytest.mark.skip in pytest)

Phase 2: Map

Build a coverage matrix:

For each spec feature, determine:

• Covered: A corresponding test case exists and its assertions match the spec
• Missing: No corresponding test case
• Stale: Test exists but assertions don't match current spec
• Skipped: Test exists with a skip marker (expected for <!-- skip: ... --> features)

Phase 3: Report

Present findings in this format:

E2E Test Coverage Audit
========================

Specs found: N files
Test files found: N files

Overall coverage: X/Y features (Z%)

By category:
  core:        X/Y (Z%)
  edge:        X/Y (Z%)
  error:       X/Y (Z%)
  side-effect: X/Y (Z%)
  idempotency: X/Y (Z%)

Gaps by suite:
  ## Task Creation (3/5 features covered)
    MISSING  [edge]        Create with very long name
    MISSING  [idempotency] Re-create after deletion

  ## Push (4/4 features covered)
    (fully covered)

Stale tests:
  push.e2e.test.ts: "push with pending changes"
    Spec says: Exits with non-zero code
    Test asserts: Exits with code 0

Structural issues:
  - task.e2e.test.ts: Tests share mutable state at suite level
  - init.e2e.test.ts: Missing afterEach cleanup for env.HOME

Do NOT suggest fixes or modifications. This command is purely diagnostic.