fix: restore Docker builds after Next.js upgrade

[novoj]

Description

Fixes the Docker build failure exposed after upgrading to Next.js 16.3.3. During next build, TypeScript checks src/tests/ai/agent-bridge.test.ts, which imports agent-bridge/lib.mjs; the Docker context previously excluded the entire agent-bridge directory.

Failed run: https://github.com/FgForrest/riffado/actions/runs/35384924483

src/tests/ai/agent-bridge.test.ts(15,8): error TS2307: Cannot find module '../../../agent-bridge/lib.mjs'

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Dependency update

Related Issues

None.

Changes Made

• Keep agent-bridge/lib.mjs in the application Docker build context.
• Continue excluding every other agent-bridge file.
• Keep the sidecar and tests out of the final application image; the runner stage does not copy them.

Testing

• docker build --progress=plain --target builder -t riffado-docker-debug:next-16.3.3-fixed .
• pnpm format-and-lint:fix
• pnpm type-check
• pnpm test src/tests/ai/agent-bridge.test.ts (35 tests passed)
• Verified the builder contains only agent-bridge/lib.mjs from the sidecar directory.

Test Environment

• OS: Linux
• Node version: 24.21.0
• Docker client/server: 29.8.1 / 29.7.1

Checklist

• My code follows the style guidelines of this project (pnpm format-and-lint)
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• Relevant existing unit tests pass locally with my changes
• Type checking passes (pnpm type-check)
• The Docker builder stage completes successfully

Database Changes

None.

Breaking Changes

None.

Additional Notes

The formatter/linter reports two pre-existing informational suggestions in src/tests/admin/elevated-cookie.test.ts. The Docker build also reports the existing PostHog build-argument secret warnings and instrumentation Edge Runtime warnings; this change introduces no new warnings.

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