Authority axis v1: mint the executive branch + link 27,804 § → office edges

The Code empowers the executive branch, but the mirror only had legislative
Bodies — every authority reference pointed at nothing. Fixed by minting the
executive branch from the Code's OWN enumerations: 15 Cabinet departments
(5 U.S.C. § 101) + 21 Executive-Schedule Level I offices (§ 5312), 42 Body
nodes under us/executive/.

Then the axis: scripts/extract_authority.py matches named office/department
references across all 59,740 sections (guarding against Deputy/Assistant/Under
subordinates) and emits data/section_authority_edges.jsonl — 27,804 edges from
17,031 sections (28.7% of the Code) to the offices they empower. build.py
renders reciprocal 'empowered by' links on each office node; the section files
are never touched. Now: click the Attorney General, see all 2,386 sections that
vest authority in it.

Named references only in v1 (cabinet-level). Deterministic; body.schema
classification enum extended (executive-department/-agency/-office); make check
green at 105,746 records.

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 check
+.PHONY: build validate board legal-us-code authority check
 
 build:        ## Regenerate the entity tree from raw exports in data/
 	python3 scripts/build.py
@@ -24,4 +24,7 @@ TITLES ?= 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 2
 legal-us-code: ## Ingest the pinned U.S. Code titles (override with TITLES="…")
 	@for t in $(TITLES); do python3 scripts/ingest_us_code.py --title $$t; done
 
+authority: ## Extract the § -> executive-office authority edges (a committed input)
+	python3 scripts/extract_authority.py
+
 check: build validate  ## Build, then validate — the full gate