Improve the agent feedback review flow (#98937)
## Summary
- review queued feedback immediately before the final response, after
requested work and tool calls are complete
- run the feedback command only when candidates exist, preserve them
when reporting is unavailable, and clear them after each qualifying
review form is opened or returned as a fallback URL
- add an internal `--dry-run` mode that returns the bundled preview
protocol without opening forms or clearing the queue
- align the managed instructions, reporting protocol, evals, tests, AI
agents guide, and API reference
## Verification
- `pnpm --filter=next types`
- focused `agent-feedback-instructions` unit tests
- `node packages/next/dist/bin/next internal agent-feedback-instructions
--dry-run`
- targeted Prettier, ESLint, and language checks
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