[grikomsn]

Summary

The token-count callback only counted top-level text, so tool results, tool arguments, thinking, and images could contribute no tokens to Copilot context budgeting. Count these input parts recursively, include message and tool framing, and show /compact recovery guidance for context-window errors.

Includes a patch Changeset for opencode-bridge-for-copilot-chat (2.1.5 → 2.1.6); the release workflow will apply the version bump.

Verification

• npm run check — 200 tests passed.
• npm run package — passed.
• npm run changeset -- status — patch Changeset validated.
• Live authenticated inference was not exercised.

Checklist

• The change is focused and contains no unrelated churn.
• Tests pass with npm test.
• Packaging passes with npm run package.
• User-visible changes include a patch Changeset.
• Relevant documentation is updated.