release: prepare v0.1.1249 RC for staging verification

[kwakayama]

Summary

• open the 0.1.1249-rc prerelease line so main publishes numbered RCs again
• keep the runtime version constant and generated hydration bundle in sync

Why

0.1.1248 is released and live in production. While deno.json holds a clean X.Y.Z, every push
to main re-enters the stable release job rather than the prerelease publisher, so the next merges
would have no RC to verify against staging. Moving to 0.1.1249-rc restores the normal
RC-then-promote cycle.

Verification

• deno task generate:manifests:check
• deno task fmt:check
• deno test -A src/config/cicd-stable-release.test.ts src/utils/version.test.ts
• the regenerated hydration bundle differs only in its embedded version string
  (var VERSION = "0.1.1248" → "0.1.1249-rc")

Released in production

Veryfront 0.1.1248 shipped from 559f04bae4:

• API 20260822063537-cfec7bdcc341 (api#4475)
• Server / Proxy / Renderer 20260822063031-849b6caab1a4 (server#327)
• Job Runner sha-df3b072520133c4dce5897dcf18518f5e36d5026-run-32557148908-attempt-1 (job-runner#77)
• Sandbox sha-f1c0781208d8f6d5f6cf9e8b4dfb709d6f4ee9cf-run-32557149043-attempt-1 (sandbox#75)

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[github-actions]

📦 Client bundle boundary

Entrypoint	Modules	Source size	Server leaks
src/index.client.ts	327	1960 KiB	✅ 0

A server module in a client graph aborts hydration in the browser. New leaks fail CI; known leaks are tracked in scripts/lint/client-bundle-baseline.json to burn down.