story-kit: create 350_story_mcp_tool_for_code_definitions_lookup

.story_kit/work/1_backlog/350_story_mcp_tool_for_code_definitions_lookup.md

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+---
+name: "MCP tool for code definitions lookup"
+---
+
+# Story 350: MCP tool for code definitions lookup
+
+## User Story
+
+As a non-Claude agent connected via MCP, I want a code intelligence tool so that I can find function, struct, and type definitions without grepping through all files.
+
+## Acceptance Criteria
+
+- [ ] get_definitions tool — finds function/struct/enum/type/class definitions by name or pattern
+- [ ] Supports Rust (fn, struct, enum, impl, trait) and TypeScript (function, class, interface, type) at minimum
+- [ ] Returns file path, line number, and the definition signature
+- [ ] Scoped to the agent's worktree
+- [ ] Faster than grepping — uses tree-sitter or regex-based parsing
+
+## Out of Scope
+
+- TBD