feat(tx1): taxonomy + lineage facets schema extension
Optional [taxonomy] + [lineage] TOML sections on capability.toml and
atom .md frontmatter. Backward-compat — all fields optional, existing
files parse unchanged.
TaxonomyFacets struct (7 facets): kingdom, mechanism, domain, layer,
stage, stability, language.
Lineage struct: parents[], creator, created, fork_from.
AtomMeta extended with taxonomy: Option<TaxonomyFacets> + lineage:
Option<Lineage>.
docs/TAXONOMY.md — canonical vocabulary. Graph-based (DAG with typed
edges), not tree. Multi-faceted nodes allowed.
3 pilot primitives tagged: policy::no-git-ops, quality::cargo-check-green,
tools::bash-allowlist.
Tests: 16/16 (was 12, +4: full/partial/no-facets/parents-array).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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