Renamed the drain's undo point to "Design View FX state" (it restores as often as it parks). Extended the nesting audit to cover a block opening inside the drain's own block. Marked post-fix undo behavior as inference pending DAW checks.
Fixes D (handle lifetime), C (ASCII dashes), G (comment compression), I (shouldReport extracted + tested); CLAUDE.md route list corrected per A/B/H. E pushed back -- cross-module GUID plumbing is architectural, not a targeted fix.
Extracts parkReadyAt/parkIsReady as a tested pure fold per PLAN.md's phase
criterion; the rest is wording fixes — hitch bound, hazard width, forced-drain
scope, progressive CPU reclaim.
A rapid A→B→A flip now costs no plugin work: the restore cancels the still-pending
park outright. A park that has already written one FX carries a `partial` flag and is
superseded by its inverse rather than cancelled, so a half-parked chain is never stranded.
daniel