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The JS half of the phase-7a serializer (TLC Part II §1, executor-state
hazard): the executor's stageSlots map (stageId → native slotId) is built at
load time, but any direct loadPreset/clearChain from the audio_engine bundle
or rig_builder's legacy path silently invalidated it — subsequent
setStageBypass/setStageParameter/activateSegment flipped bypass/params on
the WRONG slots or returned no-target with nothing detecting the divergence.
Now: the route records the chainGeneration its load returned; every stage
operation compares it against getChainGeneration() first and reports a
stale-route no-target ('re-load the plan', with expected/current generations)
instead of mutating someone else's chain. loadChainPlan also verifies the
generation didn't move between its loadPreset and the getChainState slot
mapping, rolling back if a foreign write landed in that window. Old addons
without the counter degrade gracefully (checks no-op).
Pinned by a new executor test: fresh route flows, foreign bump → all three
stage ops refuse without touching native slots.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>