v0.2.0

Added

• SWE-bench evaluation harness (evaluation/swebench/) — run misterdev on
  real GitHub-issue tasks and grade the patch against the task's own hidden
  tests. Includes a Docker runner that executes the build/test gates inside each
  instance's official image, so a task runs in its exact environment.
• Complete reference sites — every external call site of a symbol being
  edited is surfaced up front, so a delete/rename/refactor updates them all in
  one attempt instead of chasing missed callers one build-error at a time.
• Dangling-reference gate — a deterministic pre-build check that rejects an
  edit which removes or renames a symbol while leaving references to it.
• Prompt caching — the stable context prefix is marked cacheable (Claude),
  so a task's retries re-read it at a fraction of the input cost; cache reads are
  priced accordingly in the budget and ledger.
• Smarter model ledger — hard-avoids models proven incompetent on a task
  cell, skips models proven too slow, warm-starts a cold cell from a model's
  global record (empirical-Bayes shrinkage), and reserves free models for the
  easiest tasks.
• Adversarial critic now also checks for symptom-vs-root-cause fixes and
  code duplication (DRY), and auto-enables for refactor/fix/integration tasks.

Fixed

• The symbol graph now refreshes after each task instead of going stale for the
  rest of the run.
• A completed task's status: completed is committed into its source markdown,
  so a finished devplan is no longer re-run.
• An acceptance-command manifest error no longer false-fails a task whose real
  gates already passed.
• A reverted task's untracked orphan files are cleaned up (bounded to files the
  task created).
• Multi-file edits apply atomically, rolling back on a mid-batch write failure.
• An out-of-credits (HTTP 402) response halts the run gracefully instead of
  crashing with a stack trace.