Legislation axis: Bill schema, OpenStates ingest, validator + provenance

The legislative-process corpus, parallel to the U.S. Code statute corpus.
schemas/bill.schema.json + scripts/ingest_legislation.py (deterministic,
stdlib-only, reads per-state JSONL from the depot); validate.py gains
legislation/ as a third tree; Makefile 'legislation' target. Raw JSONL stays
off-repo on the depot (gitignored); the per-state SHA-256 manifest is the
committed provenance anchor. Vintage 2026-07-01.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Makefile

@@ -1,7 +1,7 @@
 # Republic OS — repeatable pipeline commands.
 # The build is deterministic: `make build` twice yields a byte-identical tree.
 
-.PHONY: build validate board legal-us-code authority check
+.PHONY: build validate board legal-us-code authority legislation check
 
 build:        ## Regenerate the entity tree from raw exports in data/
 	python3 scripts/build.py
@@ -27,4 +27,10 @@ legal-us-code: ## Ingest the pinned U.S. Code titles (override with TITLES="…"
 authority: ## Extract the § -> executive-office authority edges (a committed input)
 	python3 scripts/extract_authority.py
 
+LEG_VINTAGE ?= 2026-07-01
+LEG_STATES ?= ak al ar az ca co ct de fl ga hi ia id il in ks ky la ma md me mi mn mo ms mt nc nd ne nh nj nm nv ny oh ok or pa ri sc sd tn tx ut va vt wa wi wv wy
+
+legislation: ## Ingest enacted state legislation from the depot export (override LEG_STATES="fl ca")
+	@for s in $(LEG_STATES); do python3 scripts/ingest_legislation.py --state $$s --vintage $(LEG_VINTAGE); done
+
 check: build validate  ## Build, then validate — the full gate