Summary

• Pass toolContext.directory through SkillMcpClientInfo to StdioClientTransport's cwd parameter so that stdio MCP child processes inherit the correct workspace directory instead of process.cwd()

Problem

In OpenCode web multi-workspace mode, skill_mcp spawned stdio child processes used process.cwd() (the directory where opencode web was started) rather than the session's workspace directory. This meant MCP servers that rely on the working directory (e.g., file-based databases, linters) would operate on the wrong project.

OpenCode's built-in MCP correctly passes Instance.directory as cwd to its StdioClientTransport. This PR brings skill-embedded MCPs to parity.

Changes

• SkillMcpClientInfo type: added optional directory field
• tools.ts: populate directory from toolContext.directory
• stdio-client.ts: conditionally pass cwd to StdioClientTransport when directory is present

Test plan

• Existing 110 tests pass (0 regressions)
• New test: verifies toolContext.directory is forwarded to manager via SkillMcpClientInfo

Summary by cubic

Pass the session’s workspace directory to stdio MCP child processes as cwd so servers run against the correct project. Fixes multi-workspace mode where processes inherited process.cwd().

• Bug Fixes
  • Add optional directory to SkillMcpClientInfo.
  • Set it from toolContext.directory and pass as cwd to StdioClientTransport when present.
  • Add test confirming the directory is forwarded to the manager.

^{Written for commit df172ac. Summary will update on new commits.}