Mod: mining rig, graphics cards, trading terminal, nightly settlement

First playable slice, tested in game on the test save:
- Network upgrade "Mining Access" (300) delivers a trading terminal, a
  mining rig and an RZX 50.
- The rig is a machine with a battery slot and four card slots; each night
  it draws its total power from the battery and its cards mine PSCoin.
  Cards show hashrate, power draw and condition, wear every night and can
  burn out. All state lives on item tags or in the mod save data.
- Trading terminal with wallet, trade (four pairs, deposit credits as CRC,
  withdraw CRC through the compliance desk) and report pages.
- Nightly log lines; exchange opening and halving news on the paper.
- English and Chinese text; sprites generated by art/sprites.py.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Decentralized/ModFiles/manifest.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Manifest>
+  <ID>probably_decentralized</ID>
+  <Name>Probably Decentralized</Name>
+  <Author>edward</Author>
+  <ModVersion>0.1.0</ModVersion>
+  <Description>Mine PSCoin with graphics cards, trade it on a fictional exchange, and cash it out past the compliance desk. Work in progress. All coins, exchanges and events are fictional and have no real-world value.</Description>
+  <GameVersions>
+    <Version>0.46</Version>
+  </GameVersions>
+  <Prerequisites />
+  <Assemblies>
+    <Assembly>ProbablyDecentralized.dll</Assembly>
+    <Assembly>ProbablyDecentralized.Domain.dll</Assembly>
+  </Assemblies>
+  <Capabilities />
+</Manifest>