* fix(onboard): detect installed skill packs via install manifest
Onboarding's _step_skills only inspected USER_SKILLS_DIR and matched
recommended entries by directory-name hint, so a pack like
EvoScientist/EvoSkills@skills (which explodes into paper-writing/,
evo-memory/, etc. under GLOBAL_SKILLS_DIR) was never detected and kept
appearing as not-yet-installed.
skills_manager now writes a per-tier .installed.yaml mapping skill
directory name -> original install source on every install, removes the
entry on uninstall, and exposes installed_sources(). _step_skills checks
both tiers and treats a recommended source as installed when present in
any manifest -- so packs are recognized regardless of how their child
dirs are named.
* fix(onboard): write install manifest atomically
Stage to a sibling temp file, fsync, then os.replace into place. A crash
mid-write can no longer leave a half-written .installed.yaml behind,
which would otherwise wipe out pack detection until the next reinstall.
* style: fmt
* fix(onboard): catch decode errors when loading install manifest
read_text() can raise UnicodeDecodeError on a hand-edited or corrupt .installed.yaml; pin encoding="utf-8" and add UnicodeError to the except clause so the function honors its "returns {} on any error" contract.
dinos
73928a2d78