Compactify the descriptive markdown: scope statement replaces the
g_V-extraction goal, package architecture describes the single
theory-only distributable, roadmap keeps calculator capabilities
(C1-C8) and drops the analysis tracks, structure trees match the
actual file layout, the bs_exp debug step and detector-parameter
convention wording are dropped.
- Mark v0.4.0 as complete in TODO.md with all phases checked
- Update Phase 4 items with actual outcomes
- Next step: Track A 99Tc spectrum-shape analysis
- Add AGENTS instruction to update project metadata on significant
structural changes (package additions, version bumps, etc.)