Close the institutional gap: bodies, committees, leadership

The seat data answered 'who represents this place?' but not 'who runs
this institution?' — the Speaker of the House existed only as the rep
for LA-4. This adds the missing axis of institutional power.

New Body entities (233): the U.S. House, U.S. Senate, Executive Office,
49 committees, 181 subcommittees — each with its leadership.

Federal people (532/542) enriched with bioguide IDs, leadership roles,
and committee seats, reconciled from congress-legislators by name.
Mike Johnson is now Speaker of the House, not just LA-4.

Sources ingested directly into the repo (repo-canonical): Atlas
supplied bodies/leadership/committee_memberships via congress-legislators,
committed raw in data/. build.py supersedes convert_officeholders.py and
reads all four inputs in one deterministic pass (byte-identical on rerun).

The 10 unenriched federal records are a finding, not a bug: vacancies,
the President, and ~5 seats where Atlas's roster disagrees with the
authoritative current roster — model-vs-reality discrepancies to surface.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

data/jurisdictions/us/bodies/united-states-senate.md

@@ -0,0 +1,21 @@
+---
+type: Body
+title: "United States Senate"
+classification: "senate"
+chamber: "senate"
+code: "S"
+sources:
+  - field: definition
+    source: congress-legislators (unitedstates project)
+confidence: official
+tags: [body, senate]
+timestamp: "2026-07-03"
+---
+
+# United States Senate
+
+Chamber (senate).
+
+## Source
+
+- definition: congress-legislators (unitedstates project)