feat: Machine v2 — triage-first architecture with unified solver

fix: block orchestrator from inline Bash heredoc coding too

feat: PostToolUse hooks — auto-inject decision_tree.py on 3+ Bash failures

feat: hook to warn orchestrator when it directly writes solve files

chore: gitignore knowledge/techniques/ — auto-generated, local only

fix: enforce orchestrator never codes — must re-spawn agents on failure

docs: update README — ctf mode now includes writeup, add decision_tree, challenge.md

refactor: merge learn mode into ctf — always write up + index

fix: challenge.md grep pipe fails with set -euo pipefail when no flag format found

docs: circle_encryption writeup + flag + updated technique

fix: sage is now in PATH via symlink, simplify crypto agent calls

feat: crypto agent — SageMath first, explicit path, flag format constraint

feat: auto-load challenge.md into agent prompt

fix: flag detection — remove overly aggressive filter + add checkpoint-free fallback

refactor: extract decision trees from agent .md to tools/decision_tree.py