Add codebase scanner, CLAUDE.md init, and usage-focused workflow

- ctc scan: runs linters/tests/type-checkers to find errors without
  burning AI tokens. Auto-detects Python, Node, Rust, Go projects.
- ctc init: drops a CLAUDE.md into any repo teaching Claude Code to
  work efficiently (chunk work, commit often, read scan results first).
- Updated README with the actual workflow: scan -> paste -> fix.

https://claude.ai/code/session_01Fzv8baXnEVVhnrffAb3Ucc

claude_task_chunker/decomposer.py

@@ -42,7 +42,7 @@ class TaskChunk:
 
         if self.depends_on:
             deps = ", ".join(f"Task {d}" for d in self.depends_on)
-            lines.append(f"## Prerequisites")
+            lines.append("## Prerequisites")
             lines.append(f"This task depends on: {deps}. Those changes should already be committed.")
             lines.append("")