feat: add multi-language support roadmap — Python, Go, Rust (post-MVP)

[charannyk06]

Priority: P3 — Low (Roadmap)

Current State

ChainReview currently supports TypeScript/JavaScript repositories only. The static analysis toolchain (ts-morph for call graphs, TypeScript compiler for patch validation) is TypeScript-specific.

Roadmap for Multi-Language Support

This is a tracking issue for future multi-language support. Each language requires:

1. Call graph tool — equivalent to ts-morph for TypeScript
2. Patch validation — compiler/linter check for the target language
3. Semgrep rules — Semgrep supports Python/Go/Rust natively ✓
4. Language-specific agent prompts — may need adjustment per language

Proposed Languages (by demand)

Language	Call Graph Tool	Patch Validator	Effort
Python	pycallgraph / ast module	mypy / pyflakes	Medium
Go	go/callgraph	go build	Medium
Rust	cargo-call-stack	cargo check	High
Java	javac AST	javac	High

Architecture Changes Needed

• Abstract GraphTool interface with language-specific implementations
• Abstract PatchValidator interface
• Language detection from repo file extensions
• Per-language agent prompts

Near-term (Python)

Python is the most-requested language. A minimal Python implementation could:

• Use Semgrep for pattern scanning (already supported ✓)
• Use ast module via subprocess for call graph
• Use mypy for patch validation

Acceptance Criteria (Tracking Issue)

• Python support implemented (separate PR/issue)
• Go support implemented (separate PR/issue)
• Language detection logic added
• Multi-language documented in README