chore(interaction): remove retired readiness forwarding

[thymikee]

Summary

Remove interaction readiness forwarding left after the target wait's producer and public contract were retired. Preserve prior warnings and typed replay-cause evidence.

Five files: delete the two forwarding sites and obsolete response/replay/MCP fixtures. Runner and device readiness are unchanged.

Closes #3607.

Validation

Tested head: 3d8da459f140124215ffcc05184d30040137630b (base fc224bc1e1).

• pnpm check:affected --base fc224bc1e1 --head 3d8da459f1 --run: passed.
• Fresh-context review: no actionable findings.
• Deletion-only cleanup; no regression is attributed to a live producer.

CI checks are pending. No live-device verification was needed for removing unreachable forwarding.

[cubic-dev-ai]

No issues found across 5 files

_{View guided diff | Turn on auto-fix | Re-trigger cubic}

[github-actions]

Size Report

Metric	Base	Current	Diff
Installed (including dependencies)	5.25 MB	5.25 MB	-68 B
Package (unpacked)	5.25 MB	5.25 MB	-68 B
Package (download)	1.58 MB	1.58 MB	-24 B

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	26.6 ms	26.1 ms	-0.5 ms
CLI --help	77.6 ms	76.0 ms	-1.6 ms

[thymikee]

The code in 3d8da45 looks good. Removing the retired readiness forwarding is a deletion-only change, and I found nothing wrong with it. I did not run pnpm check:affected or any tests locally, so this is a read of the diff. The Coverage job failed, but its step log is not available yet, so I can't rule out a threshold or flake cause. Because the diff adds no routes, exports or API surface, I think the failure is unrelated. Please check the log once it exists. Compatibility & Provenance is still queued. There are no conflicts. No code change is needed. Before merge, Coverage must go green and Compatibility & Provenance must finish.

[thymikee]

Inspected the completed Coverage log. Its sole failing test was the stale packages/daemon/src/index.ts over-ceiling approval, not readiness behavior or a coverage threshold. Main removed that expired row in #3653. Compatibility & Provenance also finished successfully. This PR is already merged, so no further readiness change is needed.