revert: restore route event contracts

[ScriptedAlchemy]

Reverts #664 after merged-main CI failed deterministically across Node 22/24/26.

The #664 event contract change broke generated route type assertions and production operator-env expectations. This reverts that feature and stabilizes the pre-existing dev-route acceptance race by binding direct-process comparisons to the epoch actually invoked and writing operator env to each active epoch immediately before invocation.

Local gate:

• PASS — pnpm build && pnpm typecheck && pnpm lint && pnpm test:unit
• PASS — pnpm exec rstest --config rstest.integration.config.ts packages/agent-bundle/tests/route-register-typegen.test.ts packages/agent-bundle/tests/route-invocation-dev-server.test.ts packages/agent-bundle/tests/prepack.test.ts (29 passed)

Deslop: GPT-5.6 Sol, 2 edits (reverted the broken feature wholesale; replaced stale epoch assumptions without adding a helper).

Self-review: pending Claude Fable 5.1 Thinking High.

[changeset-bot]

🦋 Changeset detected

Latest commit: 6d9542a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
agent-bundle	Patch

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[pkg-pr-new]

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle@668

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/create-agent-bundle@668

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/rsc-markdown-stream@668

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/@agent-bundle/runtime@668

commit: b3e0043

[ScriptedAlchemy]

Closing without merge. Current main now contains #667 (npm-root prepack paths), #669 (ignore package compile scratch so dev does not self-rebuild), and #670 (the #664 event input type/docs follow-up). Those changes directly address every failure from run 34006833369 while preserving #664, so reverting it would now regress the intended feature and its updated contract.