v0.3.0

First release published to PyPI — pip install aporn-tool, then run aporn-tool <mode> --in …
(the one-word aporntool and python -m aporntool also work).

Added

• Target + coordinate auto-detection — --target is now optional: when omitted, the object name
  and coordinates are read from the subs' FITS header (OBJECT + RA/DEC), so unlisted targets
  (e.g. VdB 106) work with no manual coords. --out is now optional too, defaulting to a <TARGET>
  folder beside the input subs. The everyday command is just mode + --in (e.g.
  aporntool dso-mosaic --in "/path/to/M31 subs"). --target/--out still override.
• --clean flag (all dso-* modes): on a fully successful run, deletes the working files in
  _work/<target>/ except the golden anchor (02_linear/<TARGET>_Linear.fit), the manifest, and
  logs. Reclaims almost all scratch disk (a real M8 run went 18 GB → 25 MB) while keeping a cheap
  re-finish — --from bge (mosaic/reflection) or --from finish (emission/cluster) rebuilds every
  deliverable from the anchor with no re-stack. Off by default; a failed run never cleans, so resume
  always works.

Removed

• --coords flag — no longer needed now that coordinates are read from the FITS header. The
  resolve_target(name, coords=…) library function still accepts explicit coords.