* feat(tooling): add tsgo typecheck lane for scripts/**
* fix(scripts): burn down scripts type debt surfaced by the new lane
Typing-only except bugs the lane surfaced: gh-read timeout race,
Discord Headers spread dropping entries, undefined allowedHeadBranches
match, plugin-boundary matchAll crash. Deletes retired config keys from
fixtures/benches (prompt snapshots regenerated, config dump only) and
the orphaned non-runnable sync-moonshot-docs script. Adds full-surface
.d.mts declarations for existing .mjs boundaries.
