Remote sessions abort when plugin package version is unavailable

[dzianisv]

Summary

On deployed preview binaries (0.0.0--<timestamp>), new sessions can stop immediately if project .opencode/tool/*.ts imports @opencode-ai/plugin.

Repro

1. Run opencode serve from a locally-built preview binary (0.0.0--...).
2. Open a project that has custom tools importing @opencode-ai/plugin.
3. Start a new chat and submit a prompt.
4. Session aborts immediately (prompt_async failed).

Evidence

From remote runtime logs for failing session ses_1c24a46caffenVRq79f7DHVoBq:

• error=Cause([Fail(NpmInstallFailedError (cause: @opencode-ai/plugin: No matching version found for @opencode-ai/plugin@0.0.0--202605181903.))]) background dependency install failed
• Cannot find module "@opencode-ai/plugin" ... /.opencode/tool/github-pr-search.ts

Expected

If a matching plugin version is unavailable, session startup should not hard-fail. Either:

• fall back to a compatible plugin version (e.g. latest), or
• skip broken user tools with a surfaced warning and continue core session execution.

[dzianisv]

Fix merged in PR #216 and redeployed to remote VM.

Deployment:

• Merge commit: de9aa9c
• Service version: 0.0.0--202605190128
• Health: {"healthy":true,"version":"0.0.0--202605190128"}

Post-deploy runtime logs show the previously failing session (ses_1c24a46caffenVRq79f7DHVoBq) now enters prompt loops (step=0/1/2) with no prompt_async failed, no Cannot find module "@opencode-ai/plugin", and no No matching version found errors.