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/joint/committees/commission-on-security-and-cooperation-in-europe.md

@@ -0,0 +1,30 @@
+---
+type: Body
+title: "Commission on Security and Cooperation in Europe"
+classification: "committee"
+chamber: "joint"
+code: "JCSE"
+leadership:
+  - person: "Roger F. Wicker"
+    role: "co-chair"
+sources:
+  - field: definition
+    source: congress-legislators (unitedstates project)
+confidence: official
+tags: [body, committee, joint]
+timestamp: "2026-07-03"
+---
+
+# Commission on Security and Cooperation in Europe
+
+Committee (joint).
+
+## Leadership
+
+- co-chair: Roger F. Wicker
+
+9 members (see each member's file for their seat on this body).
+
+## Source
+
+- definition: congress-legislators (unitedstates project)

data/jurisdictions/us/bodies/joint/committees/joint-committee-of-congress-on-the-library.md

@@ -0,0 +1,33 @@
+---
+type: Body
+title: "Joint Committee of Congress on the Library"
+classification: "committee"
+chamber: "joint"
+code: "JSLC"
+leadership:
+  - person: "Bryan Steil"
+    role: "chair"
+  - person: "Mitch McConnell"
+    role: "vice-chair"
+sources:
+  - field: definition
+    source: congress-legislators (unitedstates project)
+confidence: official
+tags: [body, committee, joint]
+timestamp: "2026-07-03"
+---
+
+# Joint Committee of Congress on the Library
+
+Committee (joint).
+
+## Leadership
+
+- chair: Bryan Steil
+- vice-chair: Mitch McConnell
+
+10 members (see each member's file for their seat on this body).
+
+## Source
+
+- definition: congress-legislators (unitedstates project)

data/jurisdictions/us/bodies/joint/committees/joint-economic-committee.md

@@ -0,0 +1,36 @@
+---
+type: Body
+title: "Joint Economic Committee"
+classification: "committee"
+chamber: "joint"
+code: "JSEC"
+leadership:
+  - person: "David Schweikert"
+    role: "chair"
+  - person: "Margaret Wood Hassan"
+    role: "ranking-member"
+  - person: "Eric Schmitt"
+    role: "vice-chair"
+sources:
+  - field: definition
+    source: congress-legislators (unitedstates project)
+confidence: official
+tags: [body, committee, joint]
+timestamp: "2026-07-03"
+---
+
+# Joint Economic Committee
+
+Committee (joint).
+
+## Leadership
+
+- chair: David Schweikert
+- ranking-member: Margaret Wood Hassan
+- vice-chair: Eric Schmitt
+
+20 members (see each member's file for their seat on this body).
+
+## Source
+
+- definition: congress-legislators (unitedstates project)

data/jurisdictions/us/bodies/joint/committees/printing.md

@@ -0,0 +1,33 @@
+---
+type: Body
+title: "Joint Committee on Printing"
+classification: "committee"
+chamber: "joint"
+code: "JSPR"
+leadership:
+  - person: "Mitch McConnell"
+    role: "chair"
+  - person: "Bryan Steil"
+    role: "vice-chair"
+sources:
+  - field: definition
+    source: congress-legislators (unitedstates project)
+confidence: official
+tags: [body, committee, joint]
+timestamp: "2026-07-03"
+---
+
+# Joint Committee on Printing
+
+Committee (joint).
+
+## Leadership
+
+- chair: Mitch McConnell
+- vice-chair: Bryan Steil
+
+10 members (see each member's file for their seat on this body).
+
+## Source
+
+- definition: congress-legislators (unitedstates project)

data/jurisdictions/us/bodies/joint/committees/taxation.md

@@ -0,0 +1,33 @@
+---
+type: Body
+title: "Joint Committee on Taxation"
+classification: "committee"
+chamber: "joint"
+code: "JSTX"
+leadership:
+  - person: "Mike Crapo"
+    role: "chair"
+  - person: "Jason Smith"
+    role: "vice-chair"
+sources:
+  - field: definition
+    source: congress-legislators (unitedstates project)
+confidence: official
+tags: [body, committee, joint]
+timestamp: "2026-07-03"
+---
+
+# Joint Committee on Taxation
+
+Committee (joint).
+
+## Leadership
+
+- chair: Mike Crapo
+- vice-chair: Jason Smith
+
+10 members (see each member's file for their seat on this body).
+
+## Source
+
+- definition: congress-legislators (unitedstates project)