v0.18.0 — lean-loop: closeout collapse, triage slimming, standard eval arm

The lean-loop release: a three-reviewer over-engineering audit of the methodology (run from
the dev harness; two independent Opus 5 reviewers plus a Fable fork, cross-examined to
consensus) found the weight concentrated at the loop's finish line and on triage's hot path.
This release removes it, and gives the benchmark the arm the audit said was missing.

Changed

• Closeout is ONE scripted action (skills/triage/references/closeout.md): the single
  lcd-triage-log.sh closeout append, with the opt-in evaluator dispatch folded in before it
  and the opt-in lcd:reconcile fold after it — no longer a numbered multi-step contract.
  --iters is now optional (--lane/--audit/--reroutes/--interventions stay
  mandatory); both closeout line shapes — with and without red-green iters — are valid, and
  existing logs are never rewritten.
• Triage skill slimmed ~1,930 → ~935 words on the every-item path: the three lane
  execution bodies moved to skills/triage/references/lanes.md (read only for the routed
  lane), the re-routing procedure to references/rerouting.md, the worked-examples table
  dropped, and the file-count-soft-proxy rationale deduplicated to a pointer at rules/lcd.md.
• rules/ac-convention.md slimmed to the format contract (~1,040 → ~660 words on the
  auto-load path): the EVAL-coverage / must-not essay now lives in /lcd:specify and the
  worked AC examples in /lcd:test-gen — each at its point of use.

Added

• evals/run-eval.sh --triage-routed — the median-lane benchmark arm the T1 campaign
  lacked: a frozen prompt (evals/feature-prompt-standard.md, feature paragraph identical to
  the Deep arm's) that routes through lcd:triage instead of mandating the Deep pipeline and
  never names an expected lane; lane-agnostic EVAL-DONE finish line. Contradicts
  --baseline.
• Plan **Test scope:** declaration (template + audit): restricts the audit's
  AC-N (SURFACE) test grep to the work-item's own test paths.

Fixed

• bin/audit-crosspath.sh: stale foreign AC literals can no longer produce an OK row
  when a test-scope is declared — the repo-wide first-match grep (the T1 audit's recorded
  false-positive source) is now scoped, with a declared-but-missing scope counting as a miss,
  never a fallback. Scope-less plans keep the legacy behavior.
• bin/lcd-boundary-check.sh: {a,b} boundary entries now match. case patterns never
  brace-expand, so a brace entry could match nothing and silently denied every edit under it
  (open since 0.15.1); entries are now brace-expanded (lcd_expand_braces in
  bin/lcd-hooklib.sh) at match time, with the original entry kept in the deny reason.