v0.6.3

Added

• env --into FILE writes the output into FILE as the one block env owns
  there, replacing the block an earlier run wrote and keeping every other line.
• With --diff --format export, a PATH that is the caller's own with entries
  put in front is written as export PATH='<entries>'"${PATH:+:$PATH}", so it
  stays short and keeps what the sourcing shell has.
• When dotagents runs from a .pyz, env exports AGENTS_PYLIB, the path
  of that archive. The libraries it bundles (duho, pathlib_next) import from
  it, so an overlay built on duho works even when the interpreter in
  AGENTS_PYTHON has no duho installed. An installed dotagents sets nothing:
  its libraries are already importable from AGENTS_PYTHON. The archive is
  never put on PYTHONPATH, where it would shadow a project's own copy; a
  consumer adds it to sys.path itself when its import fails.

Fixed

• The Claude Code SessionStart hook no longer appends the whole environment to
  $CLAUDE_ENV_FILE every time it runs (startup, resume, compact, clear). Claude
  Code inlines that file into every Bash command, and once it passed about 8 KB,
  Git for Windows' bash truncated the command and every Bash call failed with an
  unterminated quote. The hook now uses env --into, which keeps one block.
  Re-run dotagents init -g to update an installed hook.

Full Changelog: v0.6.2...v0.6.3