fix(client): address PR #40 review — 13 suggestions

- Rename _insert to insert_state in main.gd (Hoshe #1)
- Add after_each() to test_bug_report_ring_buffer.gd for GameState
  cleanup on assertion failure (Hoshe #2)
- Add after_each() to test_insert_off_behavior.gd for stance/interaction
  restore on assertion failure (Hoshe #3)
- Fix assertion message: "unknown" → "unavailable" (Hoshe #4)
- Document memory ceiling of 60 JSON snapshots in ring buffer (Hoshe #5)
- Add precision warning for u64 rng_seed via JSON float (Hoshe #6)
- Promote _action_enum_to_wire to public action_enum_to_wire (Tyre #1)
- Add @warning_ignore for unused _tick parameter (Tyre #5)
- Document insert_active assumption for future no-insert characters (Tyre #4)
- Restructure OQ-07 decision amendments as bullet points (Tyre #7)

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

client/scripts/main.gd

@@ -84,13 +84,13 @@ func _process(_delta: float) -> void:
 
 		# OQ-07 (#522): propagate insert state to all z-layer-6 display nodes.
 		# Cursor shape still fires (D-056 option a) — only verb labels suppressed.
-		var _insert := GameState.insert_active
+		var insert_state := GameState.insert_active
 		if cursor_renderer and cursor_renderer.has_method("set_insert_active"):
-			cursor_renderer.set_insert_active(_insert)
+			cursor_renderer.set_insert_active(insert_state)
 		if interaction_list and interaction_list.has_method("set_insert_active"):
-			interaction_list.set_insert_active(_insert)
+			interaction_list.set_insert_active(insert_state)
 		if interaction_prompt and interaction_prompt.has_method("set_insert_active"):
-			interaction_prompt.set_insert_active(_insert)
+			interaction_prompt.set_insert_active(insert_state)
 
 		# D-057: Update interaction list from game state
 		# Suppress during dialogue — player is in conversation, verb list is noise