Curate USAspending DoD obligations geography

[MaxGhenis]

Summary

• declare U.S. country geography on the usaspending.dod.prime_award_obligations Thesis docket seed, matching the existing ACTC and child-SPM pair concepts
• deterministically regenerate the Chronicle catalog so the existing UUID moves from the null-geography placeholder to the U.S. country identity
• append the required retire/succeeds events without rewriting the registry or changing any other catalog row

Why

Thesis PR #180 requires country: "US" to reproduce the conditional-pair registration context. Chronicle's catalog placeholder predated that country declaration, so Thesis containment could not find a geography-compatible row.

Validation

• uv run --locked python scripts/build_series_catalog.py --check
• deterministic byte-idempotent regeneration (catalog SHA-256 3a572f62d15b09e8c5e9a7e2c9d0ad0bd6111a54182fd552ef4fdd2f0cd89b3f)
• append-only registry validation against codex/thesis-ledger-facts (250 events)
• uv run --locked ruff check tests/test_build_series_catalog.py
• uv run --locked pytest (938 passed, 16 skipped, 5 xfailed)