fix: Installed CLI now self-updates to a dispatcher release with V2 project support

[hatayama]

Summary

• Raise the dispatcher minimum version pin from 3.0.1-beta.6 to 3.1.0-beta.16 so installed CLIs self-update to a release that understands V2 Unity projects.

User Impact

• Before: the pin floor had been stuck at 3.0.1-beta.6 since fix: Harden CLI distribution and Unity IPC security #1794, and dispatchers never self-update above the floor. Every project therefore kept running a dispatcher that predates all V2 project support — V2 delegation (feat: Delegate V2 projects through the V3 dispatcher #1807), the V2 launch hang fix (fix: Launch V2 Unity projects without hanging #1826), and detection of V2 projects referenced via file:/embedded packages (fix: Detect V2 Unity projects with file:/embedded package references or ambiguous git cache generations #1847).
• After: once a project picks up this pin, an installed 3.0.1-beta.6 dispatcher detects it is below the floor and force-updates to 3.1.0-beta.16, which includes the full V2 handling above.

Changes

• Packages/src/project-runner-pin.json: minimumDispatcherVersion raised by hand (the only manually maintained minimum declaration); dispatcherReleaseTag and dispatcherArchiveManifest stamped by stamp-dispatcher-pin, which verifies the release's sigstore attestation before recording the asset digests.
• .uloop/project-runner-pin.json: byte-identical mirror of the package pin.

Verification

• go run ./cmd/check-dispatcher-pin --network — passed (manifest matches the attested release assets)
• go run ./cmd/check-dispatcher-minimum-version — passed (pins consistent, release tag exists)
• go run ./cmd/check-release-triggers --base origin/v3-beta --head HEAD — passed

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 2a8c1c53-4abb-43b3-97d5-86496156643a

📥 Commits

Reviewing files that changed from the base of the PR and between b0f45ff and 6a15d39.

📒 Files selected for processing (2)

• .uloop/project-runner-pin.json
• Packages/src/project-runner-pin.json

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📝 Walkthrough

Walkthrough

Both project-runner pin manifests update dispatcher archive checksums and advance the dispatcher release and minimum version from 3.0.1-beta.6 to 3.1.0-beta.16. The project runner version remains unchanged.

Changes

Dispatcher pinning

Layer / File(s)	Summary
Update dispatcher artifact pins .uloop/project-runner-pin.json, Packages/src/project-runner-pin.json	Both manifests receive new dispatcher archive checksums and update the release tag and minimum version to 3.1.0-beta.16.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• hatayama/unity-cli-loop#1501: Changes dispatcher pin-loading requirements that consume these project-runner pin inputs.
• hatayama/unity-cli-loop#1507: Documents the dispatcher pin fields and compatibility model updated here.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: updating the installed CLI to self-update to a V2-capable dispatcher release.
Description check	✅ Passed	The description is directly related to the version pin update and explains the V2 Unity project support impact.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/raise-minimum-dispatcher-version-v2-compat

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