fix(opencode): convert bin script to ESM and fix local search path - #22770

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I dug into the failing unit (windows) job.

The exposed assertion on this PR is:

• packages/opencode/test/cli/tui/plugin-loader.test.ts:679 in run #34501
• https://github.com/anomalyco/opencode/actions/runs/24495888100/job/71590592817?pr=22770

The same Windows unit failure is also showing up on dev in run #34511:

• https://github.com/anomalyco/opencode/actions/runs/24496804772/job/71593564658

This PR only changes packages/opencode/bin/opencode; plugin-loader.test.ts is unchanged relative to dev. I also ran bun test test/cli/tui/plugin-loader.test.ts --timeout 30000 locally from packages/opencode on Windows here, and that file passes.

Based on that, this looks unrelated to the wrapper change in this PR and more like a Windows-only CI/environment issue in the existing test.

Follow-up issue #22799 and fix PR #22800 are up. The follow-up PR now has green hosted CI, including unit (windows), so the Windows failure that was blocking this earlier PR is now tracked and fixed separately.

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