Remove Kompass skill support from core and OpenCode

[dbpolito]

Ticket

SKIPPED

Description

Remove the unused Kompass skill surface so configuration, packaging, and docs reflect the current product scope across core and the OpenCode adapter.

Checklist

Config surface

• Remove skill-related schema and config support from shared Kompass configuration
• Keep exported core APIs aligned with the reduced configuration surface

OpenCode packaging

• Stop registering, bundling, and compiling bundled skills in the OpenCode adapter
• Remove skill-specific adapter tests and package artifacts

Docs and messaging

• Update docs and site copy to describe commands, agents, components, and tools without skills

Validation

• Verify that config loading and compilation still work without any skills support
• Confirm that OpenCode still loads bundled commands and agents correctly
• Check that docs and landing page copy consistently reflect the reduced surface area

[kompassdev]

★★★★☆

This is a well-executed refactoring that comprehensively removes skill support across the codebase. All the important pieces are properly updated: schema, types, config loading, adapter registration, tests, build scripts, and documentation.

Minor cleanup missed:

packages/opencode/tsconfig.json:10 - The exclude array still contains "skills" which references a directory being removed. Consider removing it from the exclude list for consistency since the skills directory no longer exists in this package.

[dbpolito]

Addressed the review feedback by removing the stale "skills" entry from packages/opencode/tsconfig.json so the exclude list matches the current package layout.