chore(start): Bun plugin/bun follow-ups (draft)

[running-grass]

Summary

Draft / tracking PR stacked on top of the Bun bundler adapter draft.

Primary draft: #8076 (running-grass:feat/plugin-bun-upstream)

No product code in the empty follow-up commit yet — this exists so we can discuss and land follow-ups without blocking the main experimental adapter review:

• CI e2e / example smoke for start-bun-bundler
• #tanstack-start-plugin-adapters (and related) parity vs Vite/Rsbuild
• Optionally extract bun.nitro / bun.standalone into a narrower PR if maintainers want a smaller first merge

Test plan

• Keep linked to feat(start): add experimental Bun bundler adapter (plugin/bun) #8076
• Replace this placeholder with concrete commits as items are tackled

Notes

Head: running-grass:feat/plugin-bun-follow-up (one empty chore commit above the adapter).

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​types/​bun@​1.3.14
	nitro@​3.0.0
	bun@​1.3.14
	nitro-nightly@​3.0.1-20260810-113911-16ff2809

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Deprecated by its maintainer: npm nitro Reason: IMPORTANT: please use nitro@3.0.1 From: packages/start-plugin-core/package.json → npm/nitro@3.0.0 ℹ Read more on: This package | This alert | What is a deprecated package? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Research the state of the package and determine if there are non-deprecated versions that can be used, or if it should be replaced with a new, supported solution. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/nitro@3.0.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.
Warn		Low adoption: npm ocache Location: Package overview From: pnpm-lock.yaml → npm/nitro-nightly@3.0.1-20260810-113911-16ff2809 → npm/ocache@0.2.0 ℹ Read more on: This package | This alert | What are unpopular packages? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Unpopular packages may have less maintenance and contain other problems. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/ocache@0.2.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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