package:cognitive_complexity v0.2.3

• Fix data_flow crashing with PathNotFoundException when run as a
  standalone AOT executable (dart run cognitive_complexity:data_flow@ /
  dart install), where SDK auto-discovery resolved to the app bundle
  (#21):
  • Fail fast with an actionable error (pass --sdk-path, set DART_SDK,
    or put an SDK on PATH) instead of handing the analyzer an unresolved
    SDK location.
  • Teach PATH-based discovery the Flutter checkout layout: a
    flutter/bin/dart wrapper script now resolves to
    flutter/bin/cache/dart-sdk.
  • Add a FLUTTER_ROOT discovery fallback.
  • Add a --sdk-path option to the data_flow CLI (plumbed to the
    existing DataFlowAnalyzer.sdkPath parameter); invalid explicit paths
    are rejected with a clear error.
• Fix --fail-on-increase ignoring --fail-threshold: when both are set,
  an increase now only fails the run if the new score exceeds the
  threshold. Sub-threshold increases are still reported (delta table, PR
  comment) but no longer block healthy changes such as added error
  handling. Without --fail-threshold, the strict any-increase ratchet is
  unchanged.
• Update the dart-cognitive-complexity agent skill:
  • Add explicit rule under Tier 1/2 prescribing that extracted private helper
    routines that do not read or mutate class instance state (this) must be
    declared as private top-level functions (or static methods) rather than
    instance methods.