docs: establish knowledge base (constitution, SPEC, ADRs, S0-S12, audit) - #4
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Adds griff-core::classify with BarClass (Riff/Solo/Breakdown/Clean/Unknown), BarFeatures (note count, avg velocity, pitch span), bar_features() for metric extraction, and classify_bar() for heuristic labelling. CLI gains `griff classify <file.mid>` which prints a bar-by-bar table showing class, note count, average velocity, and pitch span for every track. 12 new unit tests; 52/52 pass. cargo fmt and cargo clippy -D warnings clean.
Adds the constitutional documentation core before any refactor: - docs/glossary.md: condensed English constitution (all terms preserved, prose tightened from the Russian source). - docs/SPEC.md: scope and the non-negotiable hard rules. - docs/adr/0001-0009 (Nygard, append-only) + index: workspace, canonical score model, master timeline, forbid unsafe, swancore-first, Standard E, CLAP-first, heuristic-before-ML, ADR format. - docs/stages/S0-S12: canonical roadmap per glossary, one short doc each (goal / IO / approach / acceptance / open questions). - docs/audit/2026-05-stage-label-reconciliation.md: honestly records that earlier feat(sN) commit labels predate this constitution and do not match the canonical roadmap; git history kept, canonical numbering mandatory forward, current code reclassified as pre-canonical baseline. - docs/decisions.log.md, AGENTS.md, CLAUDE.md, README.md routing. No code changes; test suite untouched and green.
This was referenced Jun 20, 2026
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