Add persistent cross-game player bank (Refs #3)

CHANGELOG.md

@@ -6,6 +6,47 @@ T5/T6 script and each native plugin. Current versions are recorded in
 
 ## 2026-10-12
 
+### Persistent cross-game player bank — TWS #3 / Electric Cherry #146
+
+| Component | Version | Affected source |
+| --- | --- | --- |
+| `tws_t5_bank.gsc` | `1.0.0` | New `t5/scripts/tws_t5_bank.gsc` |
+| `tws_t6_bank.gsc` | `1.0.0` | New `t6/scripts/tws_t6_bank.gsc` |
+| `t5-plugin` | `1.1.0` | `t5/plugins/tws-t5-gsc-utils/src/component/bank.cpp`, `src/utils/bank.cpp`, `src/utils/bank.hpp` |
+| `t6-plugin` | `1.1.0` | `t6/plugins/tws-t6-gsc-utils/src/component/bank.cpp`, `src/utils/bank.cpp`, `src/utils/bank.hpp` |
+
+- Add `.b`, `.d <amount|all>` and `.w <amount|all>` plus help registration on
+  both engines. Store shared GUID balances and ledger history through Electric
+  Cherry's authenticated bank API. EC generates and injects a private token per
+  immutable server instance, preserving it on rebuild/move and revoking it on
+  retirement. No manual token map is required;
+  the shared telemetry token does not authorize bank operations.
+- Add native `bankLoad`, `bankStore`, `bankRemove` and `bankResponse` helpers.
+  Save cancellation before preparing a transfer, replace it with a commit
+  decision before applying points without yielding, and replay settlement
+  after map/process restarts. Invalid replies, insufficient funds, changed
+  player state, and failed journal writes leave spendable points unchanged.
+  Preserve earned `score_total`; applied withdrawals belong to the current match.
+- T5 and T6 receive equivalent behavior with their own namespaces, last-stand
+  APIs, entry points and journal directories. Other scripts are unchanged;
+  existing common help registration and telemetry match keys already suffice.
+- Compatibility: deploy Electric Cherry #146 first, then each game's plugin
+  `1.1.0` and bank script `1.0.0`, with common and telemetry `1.0.0` or newer.
+  EC host agents `1.9.0+` settle pending journals before destructive teardown.
+  No new third-party dependency, upstream pin, or loader version requirement.
+  Keep `tws-bank/<game>/` on persistent writable storage; preserve pending
+  journals when rotating credentials or restarting servers.
+- Deployment: build/install both Windows x86 DLLs and **restart the full server
+  processes**, then install the new bank scripts and create/rebuild through EC
+  to inject private credentials. Restart maps after script changes. See
+  [bank setup and recovery](README.md#player-bank-t5-and-t6).
+  No deployment was performed. Windows DLL linking, GSC compilation and live
+  Plutonium checks remain required.
+- Checks: `node tools/check_bank.mjs` exercises the actual transfer functions;
+  `python3 tools/test_plugin_bank.py` checks native journals, response validation,
+  failed writes and process recovery with sanitizers. The T6 compiler check
+  now includes all eight modules.
+
 ### T6 newcomer join eligibility — `tws_t6_join.gsc` `1.0.1`
 
 - Fix `t6/scripts/tws_t6_join.gsc` treating the initial T6 setup spawn as