Publish workflows from the skill form

[mega123-art]

Summary

• parse publish form frontmatter for type: workflow
• route workflow publishes through the existing publishWorkflow path
• keep normal skill publishes on publishSkill
• add focused routing tests for workflow, skill, and no-frontmatter publishes

Verification

• pnpm --filter @iqlabs-official/agent-sdk exec tsc --noEmit
• pnpm --filter @iqlabs-official/agent-sdk exec vitest run src/skill-market/ingest/env.spec.ts

Note: an earlier broad vitest invocation also ran unrelated session tests and hit an existing /init ENOENT failure outside this slice.

Split out of #56 per review feedback.

[zo-sol]

Thanks @mega123-art — nice work. Routing publish by SKILL.md frontmatter (type: workflow → publishWorkflow carrying requiredSkills, else a skill mint) is clean and lets the existing form sell workflows too.

I cherry-picked the core of this onto main in 5603611 (with you as co-author), keeping your env.ts + the new env.spec.ts as-is (113-line spec passes). Same reason as the sibling PRs: this branch predates the market RPC refactor (3b6b601) and #60, so a full merge would have silently reverted attachMarketHandlers (confirmed by a trial merge). The webview parts are superseded by main.

Closing as cherry-picked into main. Thanks again — credit's on the commit. 🚀