feat(cli): add zcode agent profile

[twodogegg]

Summary

• Adds a first-class zcode agent profile (display name ZCode) so Skills can be installed with --agent zcode:
  • project-level: <project>/.zcode/skills/
  • user-level: ~/.zcode/skills/
• Follows the existing makeProfile pattern with automatic detection of both scopes, and registers the profile in allProfiles / profileMap.
• Updates the install-path tables in cli/README.md and docs/skillhub/{,en/}guide/cli.md, adds a cli/CHANGELOG.md entry, and extends test/unit/agents/profiles.test.ts for the new profile.

Validation

• Backend tests passed (bun test: 561 pass, 0 fail)
• Frontend typecheck/build passed (bun run typecheck, bun run build)
• OpenAPI SDK regenerated or checked when API contracts changed (no API contract changes)
• Smoke test run when relevant (built CLI resolves --agent zcode to ~/.zcode/skills and detects an existing installation there)

Commands run:

cd cli
bun install
bun run typecheck
bun test
bun run build
node dist/index.js list --agent zcode --registry <registry> --json
node dist/index.js install @global/skillhub-cli --version 2.0.2 --scope user --agent zcode --registry <registry> --json

Risk

• User-facing impact: New --agent zcode choice and auto-detection of .zcode/skills directories; no change to existing agents or default behavior.
• Deployment or migration impact: None.
• Rollback approach: Revert the commit.

Notes

• Related issue: none
• Follow-up work: none
• Docs or operator runbooks updated when behavior changed: yes (cli/README.md, docs/skillhub/guide/cli.md, docs/skillhub/en/guide/cli.md, cli/CHANGELOG.md)

[CLAassistant]

All committers have signed the CLA.

[FenjuFu]

Thanks for adding the ZCode profile — the change follows the existing makeProfile pattern and updates both docs tables and the CHANGELOG, which is exactly what we need.

Two process items before we can merge:

1. The DCO check is failing because the commit has no Signed-off-by line. Please run git commit --amend -s --no-edit && git push --force-with-lease.
2. Please sign the CLA via the link in the CLA assistant comment above.

Could you also link ZCode's documentation for the skills directory locations (especially the user-level ~/.zcode/skills)? Once those are in place we'll approve the CI run and review.

[twodogegg]

@FenjuFu Thanks for the review! Here are the official ZCode documentation references:

• Create A Skill (English) explicitly documents the user-level location as ~/.zcode/skills/<skill-name>/SKILL.md, confirming the ~/.zcode/skills/ install directory used in this PR.
• 创建技能 (中文) documents the same user-level path.
• Import Skills From An External Agent documents both Global (user-level, available in all workspaces) and current Project (current workspace only) import targets.

The current head commit, 7e86caf2ad5762d2c936ce244abe912831a2b0f6, already includes the Signed-off-by trailer, and both the DCO and license/cla checks are passing. The CLA assistant also confirms that all committers have signed.

The Security, PR CLI, and PR Tests workflows currently show action_required. Could you please approve the CI runs and proceed with the review? Thanks!

[FenjuFu]

Thanks for the links. ~/.zcode/skills/<skill-name>/SKILL.md is confirmed in ZCode's docs. I've approved the CI runs and they all pass; the change follows the existing makeProfile pattern and keeps both doc tables and the CHANGELOG in sync. LGTM.