Use public endpoint for game bank requests (Refs #13)

CHANGELOG.md

@@ -6,6 +6,36 @@ T5/T6 script and each native plugin. Current versions are recorded in
 
 ## 2026-10-12
 
+### Public game-bank endpoint — TWS #13
+
+| Component | Version | Affected source |
+| --- | --- | --- |
+| `tws_t5_bank.gsc` | `2.0.0` | `t5/scripts/tws_t5_bank.gsc` |
+| `tws_t6_bank.gsc` | `2.0.0` | `t6/scripts/tws_t6_bank.gsc` |
+
+- Use `https://ec.thewrightserver.net/api/bank` for all balance, transfer and
+  settlement requests on both engines. Remove the `tws_bank_url` override;
+  stale settings are ignored. This configuration removal requires a major bump.
+  Keep EC's `tws_server_id` and private per-instance `tws_bank_token` authentication.
+- Both T5 and T6 receive the same behavior with their existing namespaces and
+  startup guards. Native plugins and other scripts need no source changes.
+- Compatibility: requires companion EC agent `1.9.1+` to recognize public and
+  legacy controller-derived journals during authenticated teardown settlement.
+  Existing plugin `1.1.0`, common `1.0.0+` and telemetry `1.0.0+` remain sufficient;
+  no new native API or third-party dependency requirement.
+- Deployment: update agents first. When changing endpoints, **rebuild through
+  EC** so the old process stops and its pending decisions settle before a new
+  process starts. Do not switch scripts with just a map restart in that case;
+  journals are endpoint-scoped. If the old URL already matches exactly, copy the
+  scripts and restart the map; no full server-process restart is required.
+  See [endpoint upgrade and recovery](README.md#upgrading-the-bank-endpoint).
+  No deployment was performed; agent release signing, Windows/GSC compilation
+  and live T5/T6 validation remain required.
+- Checks: portable script fixtures exercise real initialization with stale
+  overrides, every request type, authentication, empty balances and retries.
+  Native fixtures cover zero-balance and insufficient-balance replies alongside
+  existing durable storage and process-restart checks.
+
 ### Persistent cross-game player bank — TWS #3 / Electric Cherry #146
 
 | Component | Version | Affected source |