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Phase D — Final transitional-infrastructure removal

plans/prompts/wave_8/pr_d_transitional_deletion.md

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Phase D — Final transitional-infrastructure removal

Implement the FINAL Phase D of plans/cleanup-state-machines.md — read its Phase D section first: deletion is ROLLING and immediate (each C wave deletes its own temporary adapters in a separate PR landing right behind its cutover; those PRs are part of the C-wave prompts' completion, not this one). This prompt is the remainder. The plan wins.

Note the recorded correction: there is NO live-IPC version-skew window in production (updates apply on restart; one bundle). Do not look for a "supported update window" and no bake/soak of any kind before deleting transport code — the rolling deletions land immediately behind their cutovers; separation is for review clarity only. Persisted-state schema/migration code is NOT transitional — keep it.

Gate: all C-wave trailing deletions landed; A7 landed.

Scope, one commit per family:

  1. Remove any superseded renderer controllers/managers/registries the rolling deletions missed — and ONLY those actually replaced (documented resource registries may remain as an accepted end state; connection_flow/mcp_oauth per their C2 disposition).
  2. Remove remaining projection writers, atom mailboxes, and legacy IPC channels the C waves narrowed.
  3. Verify no temporary legacy adapters remain (each wave's trailing PR should have deleted its own; migrate any straggler callers first).
  4. Boundary additions per the plan: prevent reintroduction of lifecycle mirrors, untyped window routing, and module-global renderer stores.
  5. Docs: rules/state-machines.md, rules/electron-ipc.md, rules/jotai-state.md, docs/why-state-machines.md describe the implemented architecture, not the transitional one. Update the plan's Status to reflect completion; run the end-state success-criteria list as a literal checklist in the PR description, marking each criterion met or naming the tracked exception.

Verify: typecheck, full tests, lint, golden suite green, packaged E2E smoke (single- and two-window). /deep-review. Branch cleanup-d-transitional-deletion; /pr-push.