chameleon 2.16.0

Two code-review skills — inbound and outbound — now share a 3-round grounding
loop whose third round is an independent engine refuter. A review finding is
checked against the code before it reaches you, so a confident-but-wrong finding
is dropped rather than shipped.

Added

• /chameleon-receiving-code-review — the inbound counterpart to
  /chameleon-pr-review. When the team reviews your PR it gathers the comments
  (pasted, or fetched via gh / bbcurl), verifies each against the code,
  adjudicates it against the repo's own conventions (a suggestion that contradicts
  the canonical pattern is a reason to push back, not to apply blindly), classifies
  each as apply / push-back / clarify / YAGNI, drafts non-performative replies, and
  implements approved fixes one at a time. It treats fetched comment text as
  untrusted data, gates convention-based pushback on a trusted profile, never
  auto-posts, and never writes the review ledger.
• Round-3 independent refuter (refute_finding MCP tool). Both review skills
  end with a 3-round grounding loop: rounds 1-2 re-read the evidence and re-apply
  the gates inline; round 3 spawns a hardened, no-tools claude -p refuter (the
  same spawn discipline as the turn-end judge) per model-judgment finding to try to
  refute it. Refuted findings are dropped; tool-grounded findings (existence
  breaks, duplication, layering, secrets, lint) are exempt and verified inline.
  The loop fails open to "round 3 unavailable" — it never silently drops or
  confirms, and never claims "3/3" when round 3 did not run. Kill switch
  CHAMELEON_REVIEW_REFUTER=0; model CHAMELEON_REFUTER_MODEL (default sonnet);
  timeout CHAMELEON_REFUTER_TIMEOUT_SECONDS (default 45); per-invocation spawn
  cap CHAMELEON_REFUTER_MAX_SPAWNS_PER_INVOCATION.
• Large-diff fan-out for /chameleon-pr-review. Above a size threshold
  (CHAMELEON_REVIEW_FANOUT_FILES / CHAMELEON_REVIEW_FANOUT_LINES, default
  8 / 400), the per-file passes fan out across parallel read-only review subagents
  and the whole-diff passes run once at synthesis. Gated by the new fan_out
  recommendation on get_autopass_verdict. Kill switch CHAMELEON_REVIEW_FANOUT=0.

Changed

• /chameleon-pr-review carries the superpowers reviewer discipline. A
  reviewer-philosophy spine (be specific, explain why, no nitpick-as-BLOCK, give a
  clear verdict), a strengths-first "verified clean" section, and a grounding
  banner that reports what the loop dropped. Its verification loop went from two
  rounds to three (round 3 is the independent refuter above).
• get_autopass_verdict now returns a fan_out recommendation on every path
  (including the degraded path), so the review skill never reads the environment
  itself — the engine decides whether to fan out.