goldenmatch v2.4.0

Changed

• Healer (config-suggestion) self-verify gate default flipped to the precision-sensitive cohesion proxy (cohesion_min_edge_cap50). Closes the raw-vs-live gap in review_config: suggester-gym live recovery 0.151 -> 0.543 (now equal to the raw kernel ceiling), with zero net-negatives on real perturbations. Rollback via GOLDENMATCH_SUGGEST_HEALTH=legacy. New knob GOLDENMATCH_SUGGEST_COVERAGE_CAP (default 0.50).

Added

• Healer wired into the default pipeline (advisory, every surface). dedupe_df now
  checks a free controller signal (RED/YELLOW health or a score dip) on every run and,
  only when it fires, attaches cheap raw candidate suggestions to result.suggestions --
  no second pipeline run, byte-identical timing on a healthy result. Opt into the expensive
  verified path with dedupe_df(df, suggest=True), or run the full apply-and-re-run loop
  with dedupe_df(df, heal=True) (reading result.heal_trail + the healed result.config).
  The same surface ships on CLI (--suggest / --heal plus a free default-run hint), MCP
  (review_config tool), A2A (review_config skill), REST (GET /suggest), web
  (GET /api/v1/suggest), and the TUI (Suggestions tab). Requires goldenmatch[native];
  every surface degrades gracefully without the wheel (attaches nothing, never raises).
  Kill-switch GOLDENMATCH_SUGGEST_ON_DEDUPE=0.
• Config-suggestions ("the healing loop") documentation — the iterative zero-config -> returned config -> healer-suggests-tweaks -> apply -> improve -> repeat workflow is now documented at /goldenmatch/config-suggestions.