Chameleon

Build-time barrel-chase resolution from the verified roadmap: named TypeScript
re-export barrels no longer hide a symbol's real consumers from the caller graph.

Added

• Barrel-chase resolution (default on; disable with
  CHAMELEON_REEXPORT_CHASE_MAX_HOPS=0). At bootstrap/refresh, a named
  re-export barrel (export { Impl as Public } from './impl') is followed
  through the re-export chain so an import or call of the symbol through the
  barrel is attributed ADDITIVELY to the file that DEFINES it, not just the
  barrel. The chase is deterministic, cycle-safe, and bounded (default 3 hops,
  CHAMELEON_REEXPORT_CHASE_MAX_HOPS); it maps the name per hop (an as alias
  re-export changes the exported name), drops ambiguous chains (same name from
  two sources) and out-of-repo targets rather than guessing, and keeps the
  original edge on the barrel intact. The barrel files traversed are recorded in
  a new via breadcrumb, surfaced (sanitized) by get_callers and
  query_symbol_importers, so a caller that never names the module is shown as
  reaching it via the barrel. This one build-time change raises caller-count
  accuracy for get_blast_radius, the Stop crossfile gate, the correctness
  judge's caller facts, and the inbound-caller injection simultaneously.
  TypeScript/JavaScript only (the extractor emits the re-export rows); Ruby and
  Python get an empty chase (clean no-op). Build-time only — no hook hot-path
  cost, no repo-code execution, no network.

Changed

• reverse_index.json and calls_index.json bump to schema v2 (importer/caller
  rows may carry an optional via chain). The load path is fail-open on a v1
  artifact, and every release stamps a fresh engine_min_version, so an existing
  repo's next session auto-refreshes and rebuilds the indexes at v2 — no manual
  action, no crash, no false clean in the migration window.
• The calls-index "barrel re-export attribution" accepted-limitation is resolved
  for named re-exports (only wildcard export * barrels remain open-set no-edge).