fix(opencode): stabilize windows ci file handling - #22800

Context after the conflict-resolution pass:

• Resolving the conflict in GitHub created a Merge branch 'dev' into fix/windows-plugin-loader-ci commit and ballooned the PR diff.
• I cleaned that up by rebuilding the branch on current dev and force-pushing only the intended Windows fix commits, so this PR is focused again.
• Local verification on Windows from packages/opencode passed:
  • bun typecheck
  • bun run test:ci -> 2010 pass, 17 skip, 1 todo, 0 fail
• This PR addresses the earlier Windows CI failure seen in fix(opencode): convert bin script to ESM and fix local search path #22770, specifically the failed unit (windows) run:
  https://github.com/anomalyco/opencode/actions/runs/24495888100/job/71590592817

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