PM Brain 4.0.0 — Structural refactor

Breaking release. If you forked before this version, read docs/legacy-migration.md before merging.

What's new

• Canonical 1–5 folder model — 1-Context/ through 5-Growth/ replace the old 00–04 layout
• system/ agent layer — orchestration, coaching, skills, and evals consolidated
• Simpler bootstrap — AGENTS.md → .cursor/rules/pm-brain.mdc → system/MEMORY.md → USER.md
• Eval harness + CI — L0–L4 stack under system/evals/ with GitHub Actions
• Personal context in USER.md

Breaking changes

• Top-level and many internal paths renamed
• Root ORCHESTRATION.md, MEMORY.md, version.json, and checkpoints/ removed
• Scattered Cursor rules consolidated into .cursor/rules/pm-brain.mdc

Migration

git fetch upstream
git merge upstream/main

Then follow docs/legacy-migration.md