## Thinking Path
> - The trusted target-branch runner workflow checks out PR code before
paid tests.
> - PR policy intentionally forbids manual lockfile commits.
> - Some runner changes legitimately alter pnpm patch hashes.
> - Frozen installs therefore fail before test selection.
> - Resolve one script-disabled lockfile from the authorized immutable
target SHA and distribute it by exact artifact ID and digest.
> - Keep provider credentials and trusted reporting outside this
resolution job.
## Linked Issues or Issue Description
Target-branch paid runner campaigns currently fail frozen install when a
PR changes pnpm patch content, even though ordinary PR CI regenerates
the lockfile.
## What Changed
- Added one credential-free target-lock job that resolves the authorized
immutable target SHA with lifecycle scripts disabled.
- Uploaded the resolved lockfile with its SHA-256 and restored it by
exact artifact ID before every target-code frozen install.
- Left trusted reporting and history jobs on the workflow SHA.
- Changed the disabled-AWS fallback from unavailable ubuntu-latest-m to
ubuntu-latest.
## Risks
The workflow evaluates pnpm lockfile resolution from authorized target
code. That job receives no provider credentials, disables lifecycle
scripts, rejects unrelated workspace mutations, and exposes only a
digest-verified lockfile artifact. Paid-secret jobs consume only that
lockfile after exact artifact-ID and SHA-256 validation.
## Verification
- Runner workflow-security focused tests pass.
- actionlint passes.
- Prettier and git diff checks pass.
## Model Used
OpenAI Codex, GPT-5.
## Checklist
- [x] Change is narrowly scoped to paid runner orchestration.
- [x] Target lock resolution has no provider credentials and disables
lifecycle scripts.
- [x] Downloaded artifacts are selected by exact artifact ID and
verified by SHA-256.
- [x] Trusted reporting and history jobs remain on the workflow SHA.
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