Tom Boucher c438fd396a test(#1676): fast-check property tests for path-prefix collapse + rewrite idempotency (#1686) ...

Delivers the property coverage promised in #1511's test scope but not landed
(follow-up #1676, epic #1507 / ADR-1508). Adds
tests/enh-1676-path-prefix-collapse-idempotency.property.test.cjs covering:

  (A) $HOME-collapse invariant for _computePathPrefix — global-under-home
      projects to $HOME/<suffix>/ (exact equality, not substring, so short
      homes like /root or /a do not false-positive); opencode is the
      documented exception (absolute form, never $HOME).
  (B) backslash->posix invariance (#1615 Windows path-leak fix).
  (C) path-rewrite idempotency for _applyRuntimeRewrites across the
      path-rewriting runtimes (f(f(c)) === f(c); attribution held at
      undefined to isolate the path axis). Non-vacuous: a sanity assertion
      proves the first pass actually rewrites the seed ~/.claude/ refs.

Pure test addition — no production code changed. Uses the shared
fast-check-setup (seed=42, numRuns=200). Closes #1676

2026-06-24 21:34:56 -04:00

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