chore(ci): pin build lock v1.8.3

[Eli Pinkerton (wallstop)]

Summary

• pin all central lock, release, and runner-preflight calls to immutable v1.8.3
• update the repository's lock-version contract where applicable
• retain the existing FIFO, schema-5 lifecycle, fail-closed runner, and cleanup behavior

Why

v1.8.3 narrowly retries GitHub's branded transient HTML HTTP 400 interstitial. Ordinary JSON HTTP 400 responses remain fail-fast. This addresses the live acquire failure observed in IshoBoy run 29529885195, which never acquired or activated Unity.

Verification

• repository-focused Unity workflow contract tests
• actionlint with shell parsing disabled locally; full CI retains normal linting
• git diff --check

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Note

Low Risk
Version-pin-only change to external CI actions and matching contract constants; no application or lock-semantics edits in this repo.

Overview
Bumps the ambiguous-organization-build-lock composite actions from v1.8.2 to v1.8.3 (immutable SHA 59a2fa98…) everywhere the Windows build workflow acquires, releases, and preflights the org Unity lock.

The contract verifier in verify-resource-cleanup-contract.mjs is updated to expect the same SHA so RC014/RC017 checks stay aligned with the workflow pins. Lock inputs, FIFO/schema-5 lifecycle, runner preflight, and cleanup proof behavior are unchanged—only the pinned action version moves forward to pick up v1.8.3’s handling of GitHub’s transient HTML HTTP 400 interstitials during acquire.

^{Reviewed by Cursor Bugbot for commit 8044cb5. Bugbot is set up for automated code reviews on this repo. Configure here.}

[Eli Pinkerton (wallstop)]

Cursor (@cursor) review exact commit 8044cb5 for immutable pin completeness, version-contract parity, and workflow regressions. Report exact zero if none.

[Eli Pinkerton (wallstop)]

copilot-pull-request-reviewer review exact commit 8044cb5 for immutable pin completeness, version-contract parity, and workflow regressions. Report exact zero if none.

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