chameleon 2.48.0

Real-usage QA pass: every shipped roadmap feature was driven through its actual
entry points (hook executables fed real payloads, the MCP stdio server, real
bootstraps) against real repositories. Most passed; this release fixes the eight
gaps that surfaced, three of them substantive.

Fixed

• Cross-workspace advisory false-fire on a same-turn repoint (WP-C5): a
  monorepo file that removed an export while a sibling package repointed its
  import elsewhere in the same turn still got flagged, naming a now-wrong source.
  The advisory now suppresses only when the importer cleanly repointed the name
  to a DIFFERENT known workspace package; a relative, aliased, external, or
  otherwise ambiguous specifier keeps the advisory, so a genuine break is never
  missed (parity with the same-workspace live re-verify).
• Auto-pass under-attributed a fully verification-suppressed session: a
  session run entirely with CHAMELEON_VERIFY=0 records no touched files, so the
  attestation's file-overlap attribution never saw it and the change auto-passed —
  the exact scenario the governance signal exists to catch. A verify-suppressed
  attestation with empty file lists is now attributed to the diff (raise-only: it
  can only route to a human, never cause a false auto-pass).
• Finding ledger silently dropped a file-less high-severity finding: a
  finding with no cited file was marked "addressed" by the content-digest proxy
  (which it has nothing to compare against) instead of being re-surfaced once.
  File-less findings now bypass the digest proxy; a high one re-surfaces once, a
  low one resolves rather than accumulating.
• Refuter model was never validated: a garbage CHAMELEON_REFUTER_MODEL
  reached claude -p --model (which would fail every verdict open), unlike the
  judge base which validates. It now falls back to a valid tier, honoring the
  same never-garbage contract as the model ladder.
• Inbound-callers pre-edit context now falls back to the calls index for a
  file's callable names when no signature artifact exists (the documented
  fallback was unreachable), so a repo without symbol signatures still gets the
  "who breaks if you change this" section.
• Cross-workspace index left an orphan under the old path-hash id after a
  no-remote monorepo's first refresh moved it to the uuid id; the stale copy is
  now removed.
• Effectiveness eval --dry-run now shows the per-arm model (the point of
  --arm-model) and runs the environment preflight it always claimed to, minus
  the Claude-CLI check that a dry run does not need.