Add installer filters for risk, category, and tags so maintainers and
users can ship smaller skill surfaces to context-sensitive runtimes.
Document the reduced-install flow for OpenCode-style hosts, add the
humanize-chinese community skill, and sync the generated catalog and
plugin-safe artifacts that now reflect the release batch.
Refs #437
Refs #440
Refs #443
Guard metadata repair and doc sync scripts against symlink targets so
repo maintenance tasks cannot overwrite arbitrary local files.
Replace recursive skill discovery with an iterative walk that skips
symlinked directories, and harden the VideoDB listener to write only
private regular files in the user-owned state directory.
Also fix the broken pr:preflight script entry and make the last30days
skill stop embedding raw user arguments directly in the shell command.
