test(assets): atlas determinism smoke test (#847)

Adds tests/run-atlas-determinism — imports generate_atlas as a module
and calls process_body() twice with seed=42 and dry_run=True, comparing
the returned markers dicts as JSON. No wiki files are written.

Guardrail against determinism regressions in terrain analysis, city
placement, A* road routing, infrastructure MST, and gate terminal
placement. GJ892f (domed, population 300, 1 city) is the smallest
well-exercised case.

Makefile target: make test-atlas-determinism.
Wired into tests/run-all alongside run-ipc-integration and run-visual.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/run-all

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 # tests/run-all: Run all test suites in order (D-030)
-# Invokes run-rust, run-godot, run-ipc-fixtures, run-ipc-protocol, run-ipc-integration.
+# Invokes run-rust, run-godot, run-ipc-fixtures, run-ipc-protocol,
+# run-ipc-integration, run-visual, run-atlas-determinism.
 # Exit: 0 = all suites pass, non-zero = any suite failed
 # Stdout: {"suite":"all","total":N,"passed":N,"failed":N,"duration_ms":N,"suites":[...]}
 set -euo pipefail
@@ -26,6 +27,7 @@ SUITES=(
     run-ipc-protocol
     run-ipc-integration
     run-visual
+    run-atlas-determinism
 )
 
 START_MS=$(date +%s%3N)