data(content): address PR #146 review — Ghawr rename, faction pins, catalog

Review fixes for the #1019 heritage rebalance:

- Marib's farm world Ghouta -> Ghawr (Miri): "Ghouta" carries strong
  modern associations (2013 Damascus attack); Ghawr (the Jordan Rift
  Valley, an irrigated lowland farming region) keeps the water-fed-
  drylands sense without the resonance.
- Add dominant_faction = "independent" to GJ 914A / 508A / 1245B (Hoshe)
  — all five rebalanced systems are self-governing independent
  communities; uniform with siblings GJ 722 / 680 and clears V-FAC-01.
- catalog.md: fill GJ 914A -> Marib and GJ 722 -> Sığınak (Hoshe) — the
  two anchor systems still showed em-dash placeholders.
- Marib gttr: name the second aperture neighbour Sığınak instead of the
  bare "GJ 722" (Miri).

Pre-existing Golestan aperture/spur wording (reviewers split on whether
it is even wrong) is left for a separate content pass — not introduced
by this rename.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/data/star_map_data.json

@@ -42199,7 +42199,7 @@
           "parent_body_id": null,
           "orbit_index": 2,
           "body_type": "planet",
-          "proper_name": "Ghouta",
+          "proper_name": "Ghawr",
           "atmosphere": "standard",
           "inhabited": true,
           "population": 18000,