Fix builtin skill slash command registration

[muwenyan521]

Summary

Fixes #4714

• Register builtin skills into OpenCode command config so migrated skill commands like /init-deep resolve again.
• Keep builtin skill commands at the lowest precedence layer so existing builtin commands and user/project/plugin commands continue to override them.
• Reuse existing builtin skill gates for disabled_skills, browser provider selection, and team_mode.enabled.

Tests

• bun test src/plugin-handlers/command-config-handler.test.ts
• bun test src/features/builtin-commands/init-deep-migration.test.ts src/hooks/auto-slash-command/init-deep-skill.test.ts src/features/builtin-skills/skills.test.ts src/features/builtin-skills/skills/team-mode.test.ts src/plugin/skill-context.test.ts
• bun run typecheck

---

Summary by cubic

Registers builtin skills as commands so migrated slash commands like /init-deep work again, while keeping command precedence intact. Applies gating through existing config flags.

• Bug Fixes
  • Add builtin skills to the command config at the lowest precedence so builtin commands and user/project/plugin commands override them.
  • Respect gates: disabled_skills, browser provider (playwright vs agent-browser), and team_mode.enabled.
  • Expand tests for inclusion, precedence (builtin command wins; project skill overrides builtin skill), and gating behavior.

^{Written for commit 1c15be6. Summary will update on new commits.}

[github-actions]

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[muwenyan521]

I have read the CLA Document and I hereby sign the CLA

[muwenyan521]

This PR should fix #4714.

The issue reports that builtin shared-skills such as /init-deep, /review-work, /start-work, /refactor, /debugging, etc. are no longer visible as slash commands in OpenCode Desktop after the v4.5.x skill restructure.

The root cause matches this PR: builtin skills are created and available as skills, but they are not registered into OpenCode's command config, so Desktop/Web slash autocomplete does not see them.

This PR registers gated builtin skills as command definitions at the lowest precedence layer, so:

• builtin commands still override same-name builtin skills
• user/project/plugin commands and skills still override builtin skills
• existing gates such as disabled_skills, browser provider selection, and team_mode.enabled are reused

[muwenyan521]

@cubic-dev-ai rereview strict

[cubic-dev-ai]

@cubic-dev-ai rereview strict

@muwenyan521 I can't start this review because your workspace has reached its free monthly review limit. Reviews resume at the start of your next billing cycle. Paid plans include much higher monthly review limits. Upgrade now to resume reviews.

[muwenyan521]

@code-yeongyu Could you please help review PR #4633 and approve the workflow? It fixes the missing built-in slash commands issue (#4714), all checks have passed. Thanks!

[muwenyan521]

@code-yeongyu Hi! I have resolved the merge conflicts with the latest dev branch. All local checks passed. Could you please approve the workflow and take a review? Thanks inside!

[code-yeongyu]

[sisyphus-bot] Thanks @muwenyan521 for chasing #4714! Closing because dev shipped the identical fix independently (49c6b43 "register builtin skills as opencode slash commands" + fc471e5 for disabled_commands) — after your upstream merge, this PR's net delta vs dev is import reordering plus tests that largely duplicate dev's existing coverage in the same file. The ~3 genuinely novel gating tests (project-skill override of a builtin skill, browser-provider gating, team-mode gating at the command-config layer) would be welcome as a small test-only PR if you'd like the contribution credit.