fix(simulation): PR #176 review round — all 12 findings + 2 recommendations addressed

H1 demux: ShapeProbe defensive multi-shape rejection (union frames now Err, not first-match; +2 tests) and doc claim made honest. H2/T1 SystemIndex.reset_test_state() folded into SimBridge.reset_test_state() (load() inline per autoload rule) + has_pending_request() accessor. H3 no-op tests now assert the replay flag both directions. H4 retry test actually ingests a failure and asserts the retry semantic. H5 error fixture uses the normalized status string. H6 bridge_tcp e2e sends all five frame shapes over real TCP (star-map + city-names buffers asserted). H7 positive replay-on-CONNECTED test via the test_local_bridge test-mode-flip precedent (stub bridge captures + decodes the request bytes). H8/T2 stale PLACEHOLDER doc replaced with the confirmed contract. H9 is_capital doc matches the COALESCE reality. T-r1 demux ceiling written down (next shape = tagged envelope). T-r2 AtlasLayerResponse governance ceiling comment. Lead item: the four cargo-fmt-formatted files from the gate round are now committed (layer_proxy/plugin/bridge-mod/main). H10 note for the record: the 13 snapshot_*.msgpack fixtures in commit 845737617 were regenerated because they were stale against their own generator (pre-existing version-key removal) — verified harmless, no client reads that key.

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

client/ui/implant/widgets/system_index.gd

@@ -32,6 +32,23 @@ static func is_loaded() -> bool:
 	return _loaded
 
 
+## True while a StarMapRequest is considered in flight — the test-observable
+## counterpart of the retry bookkeeping (see ingest()'s Error path).
+static func has_pending_request() -> bool:
+	return _requested
+
+
+## Test-only: clear the process-global static cache. Statics leak across
+## gdUnit suites in one process — the same class as the
+## SimBridge._star_map_wanted leak fixed in this PR (review H2/T1).
+## SimBridge.reset_test_state() calls this, so every suite already using it
+## gets both resets.
+static func reset_test_state() -> void:
+	_cache = []
+	_loaded = false
+	_requested = false
+
+
 ## Ask the bridge for the star map if it hasn't been fetched yet. Safe to call
 ## from every screen's _ready()/on_install() — idempotent once loaded or a
 ## request is already in flight.