AST analyzer: tree-sitter parse into FileAst model (v0.1.1)

[s1rry]

What

AST analyzer — parses a source file into a structural internal JSON model. No AI.

• New model FileAst (core): functions, classes, interfaces, imports, exports with line ranges and is_async. Serializable → JSON.
• devpilot-analysis now implements the CodeAnalyzer port on tree-sitter for Rust and TypeScript/JavaScript (incl. TSX/JSX grammars). Pure syntactic extraction via a tree walk; a parse failure is a per-file AnalysisError, never a panic. Blocking parse runs in spawn_blocking.
• Port refocus: CodeAnalyzer moves from the metrics-oriented analyze_file -> FileAnalysis (unused scaffolding) to parse -> FileAst. The metrics types stay for a later complexity step.
• Wiring: parse_file Tauri command via DI; typed lib/ipc/ast.ts.
• Rust mapping: struct/enum → classes (methods attached from impl blocks), trait → interfaces, use → imports, pub items → exports.

Verification

• cargo fmt --check, clippy -D warnings, full cargo test --workspace: clean. tree-sitter C grammars compile.
  • 3 parse integration tests over real Rust and TypeScript source (functions incl. async, class methods, interfaces/traits, imports, pub/export detection, unsupported-language error).
• cargo build -p devpilot-desktop and pnpm build (tsc strict): clean.

Scope per plan: internal model + command + tests, no UI (a symbols viewer can follow).

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