fix(loader): keep plugin entrypoint function-only

[vjda]

Closes #12

This PR focuses on the compatibility fix. The original bug report and reproduction details are captured in #12.

Summary

• remove the named runtime export from the public plugin entrypoint
• move LSOF_LISTEN_RE into an internal helper module used by runtime code and tests
• add regression coverage to ensure both source and built entrypoints only expose a default function export

Changes

File	Change
src/index.ts	stop exposing the regex from the public plugin entrypoint
src/lsof.ts	add the internal regex helper module
test/lsof-parse.test.ts	import the regex from the internal helper
test/plugin-export.test.ts	add regression coverage for source and built export shape

Test Plan

• bun run typecheck
• bun test
• bun run build

Notes for Review

• the change is intentionally narrow and only adjusts the plugin entrypoint surface
• the goal is to preserve compatibility without changing plugin behavior
• issue bug(loader): OpenCode rejects legacy plugins with "Plugin export is not a function" #12 contains the full context for the loader regression and observed runtime error

[Copilot]

Pull request overview

This PR narrows the public plugin entrypoint surface to a single default function export to preserve compatibility with OpenCode’s legacy plugin loader, while keeping the lsof parsing behavior intact.

Changes:

• Removed the named LSOF_LISTEN_RE export from src/index.ts and moved it into a new internal helper module.
• Updated the lsof parsing test to import the regex from the new internal module.
• Added regression tests to assert both source and built entrypoints expose only a default function export.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/index.ts	Stops exporting the regex from the public entrypoint; imports it internally instead.
src/lsof.ts	Introduces an internal module to hold LSOF_LISTEN_RE.
test/lsof-parse.test.ts	Updates test import to use the internal regex module.
test/plugin-export.test.ts	Adds regression tests for export shape (source + built).

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