Chameleon

Fixed

• Ruby DSL conventions were silently dropped for module-nested classes -- the
  standard Rails API layout (module Api; module V1; class UsersController).
  _RUBY_DSL_CALL_RE anchored on a literal two-space indent (^ ), so a class
  body indented to 4 or 6 spaces by its module wrappers matched nothing, and
  extract_method_call_conventions returned {} for the cohort. Controllers are
  the most module-nested archetype in every Rails app, so the archetype that most
  needs before_action / rescue_from guidance got none: on a real Rails fixture
  conventions.json carried method_calls for model/service/serializer/query and
  omitted controller entirely. The class-contract pass compounds it by filtering
  allowlisted macros out of dsl_macros on the grounds that the Common DSL line
  already covers them -- a line that never fired for nested classes.

  The extractor now prefers the parser's own class_body_calls (recorded with the
  enclosing class at any nesting depth, so indentation cannot fool it), keeping the
  raw-bytes regex only as the fallback for a degraded or legacy profile, and that
  fallback is corrected to any-indent (^[ \t]+) -- the form lint_engine's
  _RUBY_DSL_RE had all along. Same intent, two regexes, one wrong.

  End-to-end: the 9 module-nested controllers now derive
  {'common_top5': ['before_action'], 'sample_size': 9} (was {}); top-level
  models are unchanged. Found by the full-matrix Rails column, then adversarially
  verified -- which confirmed the outcome while REFUTING the reported mechanism
  (the AST extractor handles nesting correctly at any depth; only this regex did not).