fix(opencode-subagent): pass global through forDeletion

[Chen17-sq]

Summary

Addresses follow-up item 2 from #1639.

SubagentsProcessor.loadToolFiles({ forDeletion: true }) builds deletion placeholders via:

factory.class.forDeletion({
  outputRoot: this.outputRoot,
  relativeDirPath: paths.relativeDirPath,
  relativeFilePath: basename(path),
  global: this.global,
});

KiloSubagent.forDeletion already destructures global and forwards it to the constructor (PR #1635). OpenCodeSubagent.forDeletion did not, so the flag was silently dropped and the resulting placeholder always defaulted to global: false. This patch mirrors the kilo precedent — destructure global = false from the params, forward it on the constructor call.

No behavior change for project-scope deletions (which were always the default anyway). Removes the inconsistency between the two opencode-style classes called out in #1639.

Test plan

• pnpm cicheck (fmt + oxlint + eslint + tsgo + 5550 vitest + cspell + secretlint) passes locally on Node 22.
• Diff is a single file, two added lines, mirroring the kilo fix at the same call site shape — low risk.

Refs #1639 (item 2 of 2 — the KiloSubagent.validate() schema-override item is out of scope here).

[github-actions]

Thank you for your contribution! Unfortunately, you currently have 3 open PRs (including this one), which exceeds the limit of 2 for external contributors.

Please wait for an existing PR to be reviewed/merged, or close one before opening a new one. See CONTRIBUTING.md for details.

[Chen17-sq]

Closing this proactively — the github-actions bot flagged that I'm well over the 2-PR limit for external contributors documented in CONTRIBUTING.md. I opened these nine PRs in one batch without spotting that rule first, which was my mistake — sorry for the noise.

The patch in this PR is ready as-is (pnpm cicheck green, lint-staged green, pre-commit pnpm dev generate green) and stays small enough for a quick read; reopening is one click.

Keeping #1643 (refactor(utils): consolidate isPlainObject, addresses #1638) and #1644 (refactor(copilot-rule): reuse toPosixPath, addresses #1603) as my current two. I'll reopen this one — addressing #1639 item 2 — once a slot frees up.