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/autoloads/game_state.gd

@@ -42,7 +42,9 @@ var gauntlet_mode: bool = false  # true when snapshot includes gauntlet_mode fla
 
 # OQ-07 (#522): Insert active state — false suppresses verb labels (z-layer 6).
 # Cursor shape changes still fire when false (D-056 option a).
-# v0.1: always true (both detective and smuggler have inserts). Server may send false in future.
+# v0.1 assumption: always true — both playable characters (detective and smuggler)
+# have neural inserts. Future characters without inserts would receive false from
+# the server's "insert_active" snapshot field, disabling all z-layer-6 UI.
 var insert_active: bool = true
 
 # #507: RNG seed for replay determinism — populated from snapshot "rng_seed" field.