vitya 7ca5a5ad3c feat(install): add --prune flag to install.{ps1,sh} [skip-tdd: wrapper] ...

For each <name>/ dir in $target that has no matching skills/<name>/,
remove it. Catches stale installs after skill rename/retire
(motivating case: using-synology-ops just removed but install dir
lingered until manual rm).

Design choices:
- Combined flag (install + prune in one run), not standalone mode
- Prune always scans full target — does NOT respect -Names/positional
  filter, since stale-cleanup is a global concern
- Prints `pruning: <name>` per removal, no confirmation prompt
- Default off — flag must be passed explicitly

[skip-tdd: wrapper] — shell glue wrapping Remove-Item / rm -rf with
a set-difference; verified via smoke-test on disposable target dir
(fake stale dirs created, full install + prune run via env-overridden
CLAUDE_SKILLS_DIR, post-state confirmed: stale dirs removed, valid
skills installed, using-synology-ops absent as expected).

Closes 1/3 of [install-ps1] acceptance (the --prune flag). The
remaining doc .wiki/concepts/install-cross-platform.md is deferred
to a follow-up commit.

2026-05-25 13:11:10 +03:00

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