- Define immutable MAM_VERSION="3.1.0" runtime constant in lib.sh
- Bump YAML frontmatter version to 3.1.0 across all 8 skill packages
- Document v3.1.0 changelog, 2-tier TUI readiness architecture, and migration guide in VERSIONS.md
- Document new tuning knobs (MAM_KILL_ON_READY_TIMEOUT, MAM_DIALOG_TAIL_LINES, MAM_READY_EMPTY_GIVEUP) in .mam.env.example
- Add 3-way lockstep and immutability test suite in tests/test_version_consistency.py
- Bump version to 2.0.0 across all 8 multi-agent-mux skills reflecting A-4 Phase 2 adapter architecture and Option B isolation deprecation.
- Standardize author (godopu), license (MIT), platforms, environments, and metadata blocks across all SKILL.md files.