v1.36.0 — speed where it's visible + every fix is a release gate

1.36.0 — speed where it's visible + every fix is now a release gate

Driven by the second field report ("we should be 10–20× faster than grep,
we're tied"): the tie was the freshness probe, not the answer.

• Probe parallelized: the two root git ls-files spawn concurrently,
  nested-repo enumerations fan out on rayon, and the 8k-file stat sweep is
  parallel. Default-path query on an 8.7k-file monorepo: 0.21 s → 0.10 s —
  vs rg's 0.21 s without any freshness guarantee. Warm path (--no-autoheal
  / MCP between heals): 0.00–0.02 s — 10–100× rg. The honest framing: rg
  pays full scan per query; codegraph pays a freshness proof once and ~0
  after.
• Constant-path routes recovered: @Delete(SOME_CONST) endpoints are
  real — they now emit with the constant as a «symbolic» segment +
  path_unresolved: true instead of being dropped (66 real endpoints on the
  field monorepo; route accounting now closes exactly: 524 decorators =
  458 literal/bare + 66 symbolic).
• --indexstore early-return bug: with zero file changes the flag never
  reached the merge path — a re-merge no-op'ed. Fixed; field monorepo now
  carries a 46,110-edge Swift compiler oracle and codegraph audit measures
  96.1% precision (SelfThisMember 100%, SameFileUnique 96.6%,
  FieldTypeMember 83.3% on a small sample) — served via MCP stats.
• codegraph stats aliases status (agents guess the MCP tool name).
• Doc noise capped: identifier search keeps docs to ≤5 rows (one per
  file) when code answered the query.
• Release gate: scripts/release-qa.sh runs clippy-clean, the full
  suite, crash-recovery + determinism e2e, and the eval receipts — every
  field-reported bug fixed in 1.34–1.36 has a pinned regression test
  (enumeration classes, flock exclusion, MCP empty-graph/dead-root/
  generation-bump, --files machine contract, NestJS route shapes, DI
  narrowing, search ranking).