ToolContext type from @opencode-ai/plugin/tool does not include
a 'directory' property, causing typecheck failure after rebase from dev.
Changed to use process.cwd() which is the same pattern used in
session-manager/tools.ts.
- Override OpenCode's built-in glob with 60s timeout
- Kill process on expiration to prevent indefinite hanging
- Reuse grep's CLI resolver for ripgrep detection
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