docs: update README for auto-extract init flow

feat: auto-extract promises on init — no AI delegation needed

fix: clamp promise weight to valid 1-10 range

fix: quality-gate detects colocated TS/JS test files

fix: quality-gate detects Go/Python test files

feat: subagent support + track-auto + quality-gate commands

docs: final polish (Round 20/20 Production C2 FINAL)

test: stress tests (Round 19/20 Production C2)

docs: doc-code sync (Round 18/20 Ecosystem C2)

test: real-world integration (Round 17/20 Ecosystem C2)

fix: error handling audit (Round 16/20 Security C2)

fix: security hardening (Round 15/20 Security C2)

refactor: test organization (Round 14/20 Developer C2)

refactor: cycle 1 code review (Round 13/20 Developer C2)

docs: advanced user guide (Round 12/20 User C2)