feat(agents): inject workspace root for VS Code MCP init

[SutuSebastian]

Summary

• Set workspaceRootArg: true on the VS Code registry entry so codemap agents init --mcp writes --root ${workspaceFolder} in .vscode/mcp.json (parity with Cursor and this repo's dogfood config).
• Assert VS Code args in agents-init-mcp integration test; document behavior in docs/agents.md.
• Patch changeset for npm release notes.

Test plan

• bun test src/agents-init-mcp.test.ts (33 pass; pre-commit hook)
• Re-run codemap agents init --mcp in a consumer repo with .vscode/mcp.json and confirm servers.codemap.args includes --root + ${workspaceFolder}

[changeset-bot]

🦋 Changeset detected

Latest commit: 5333c2b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@stainless-code/codemap	Patch

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3bf50d65-09ed-4b1f-9f58-201eb8062cc8

📥 Commits

Reviewing files that changed from the base of the PR and between 946816d and 5333c2b.

📒 Files selected for processing (7)

• .changeset/vscode-mcp-workspace-root.md
• docs/agents.md
• src/agents-init-mcp-registry.test.ts
• src/agents-init-mcp-registry.ts
• src/agents-init-mcp.test.ts
• src/agents-init-mcp.ts
• src/cli.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/vscode-mcp-workspace-root

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