v0.5.0

Added

• Professional packaging: pyproject.toml (version derived from the git tag via
  setuptools-scm - no drift), a global decision-log console script, zero
  runtime dependencies.
• Installed-mode defaults guard (_default_base): pip-installed runs resolve
  default paths against the current directory; in-place copies keep resolving
  against the file's folder.
• CI packaging job: builds the wheel, installs it into a fresh venv, and
  smoke-tests the console script + module import.
• publish.yml: trusted publishing to PyPI, gated behind the PUBLISH_TO_PYPI
  repository variable (skipped until enabled).

Fixed

• Typed entries: parse_entries() now returns DecisionEntry dataclasses (dict-compatible via __getitem__), full type hints on all functions, and a small exception vocabulary (AgentLogError / ValidationError / LockTimeoutError) — same behavior, same exit codes.
• stdin reconfigured to UTF-8 on Windows: piped unicode no longer double-encodes into decisions.txt (stdout-only reconfigure bug).
• L10: load() no longer crashes on a locked/unreadable log file (graceful OSError fallback; regression tests added).

Docs

Fixed

• Concurrent --decide/--revise/--resolve appends no longer lose
  entries: the append is serialized by a cross-process lock file
  (<log>.lock, stdlib-only, atomic O_CREAT|O_EXCL create with 5s wait
  and stale-lock recovery) and the log is re-read inside the lock before
  writing (lost-update fix).

• Document the PR-based push workflow in the README (branch -> PR ->
  squash merge with the (AREA: <logged decision>) marker) now that
  branch protection blocks direct pushes to master.