docs: consolidate daily docs audit fixes

docs/docs/00200-core-concepts/00200-functions/00300-reducers/00400-reducer-context.md

@@ -272,6 +272,46 @@ The context provides access to a random number generator that is deterministic a
 Never use external random number generators (like `Random` in C# without using the context). These are non-deterministic and will cause different nodes to produce different results, breaking consensus.
 :::
 
+Use the context-provided random API for any reducer logic that needs random values:
+
+<Tabs groupId="server-language" queryString>
+<TabItem value="typescript" label="TypeScript">
+
+```typescript
+const fraction = ctx.random();                         // [0.0, 1.0)
+const roll = ctx.random.integerInRange(1, 6);          // inclusive
+const bytes = ctx.random.fill(new Uint8Array(16));
+```
+
+</TabItem>
+<TabItem value="csharp" label="C#">
+
+```csharp
+double fraction = ctx.Rng.NextDouble();  // [0.0, 1.0)
+int roll = ctx.Rng.Next(1, 7);           // [1, 7)
+```
+
+</TabItem>
+<TabItem value="rust" label="Rust">
+
+```rust
+use spacetimedb::rand::Rng;
+
+let value: u32 = ctx.random();
+let roll: u32 = ctx.rng().gen_range(1..=6);
+```
+
+</TabItem>
+<TabItem value="cpp" label="C++">
+
+```cpp
+auto& rng = ctx.rng();
+int32_t roll = rng.gen_range(1, 6);  // inclusive
+```
+
+</TabItem>
+</Tabs>
+
 ## Module Identity
 
 The context provides access to the module's own identity, which is useful when a reducer needs to refer to the database itself.

docs/docs/00200-core-concepts/00600-clients/00200-codegen.md

@@ -189,10 +189,10 @@ For example, a `create_user` reducer becomes:
 
 ```typescript
 // Call the reducer
-conn.reducers.createUser(name, email);
+conn.reducers.createUser({ name, email });
 
 // Register a callback to observe reducer invocations
-conn.reducers.onCreateUser((ctx, name, email) => {
+conn.reducers.onCreateUser((ctx, { name, email }) => {
   console.log(`User created: ${name}`);
 });
 ```

docs/docs/00200-core-concepts/00600-clients/00300-connection.md

@@ -26,9 +26,10 @@ Create a connection using the `DbConnection` builder pattern:
 ```typescript
 import { DbConnection } from './module_bindings';
 
-const conn = new DbConnection.builder()
+const conn = DbConnection.builder()
     .withUri("https://maincloud.spacetimedb.com")
-    .withDatabaseName("my_database");
+    .withDatabaseName("my_database")
+    .build();
 ```
 
 </TabItem>
@@ -80,9 +81,10 @@ To connect to a database hosted on MainCloud:
 <TabItem value="typescript" label="TypeScript">
 
 ```typescript
-const conn = new DbConnection.builder()
+const conn = DbConnection.builder()
     .withUri("https://maincloud.spacetimedb.com")
-    .withDatabaseName("my_database");
+    .withDatabaseName("my_database")
+    .build();
 ```
 
 </TabItem>
@@ -126,10 +128,11 @@ To authenticate with a token (for example, from [SpacetimeAuth](../00500-authent
 <TabItem value="typescript" label="TypeScript">
 
 ```typescript
-const conn = new DbConnection.builder()
+const conn = DbConnection.builder()
     .withUri("https://maincloud.spacetimedb.com")
     .withDatabaseName("my_database")
-    .withToken("your_auth_token_here");
+    .withToken("your_auth_token_here")
+    .build();
 ```
 
 </TabItem>

docs/docs/00200-core-concepts/00600-clients/00700-typescript-reference.md

@@ -1088,7 +1088,7 @@ function MyComponent() {
   return (
     <div>
       <p>Connected as: {identity?.toHexString()}</p>
-      <button onClick={() => conn?.reducers.createPlayer('Alice')}>
+      <button onClick={() => conn?.reducers.createPlayer({ name: 'Alice' })}>
         Create Player
       </button>
     </div>
@@ -1136,7 +1136,7 @@ import { useReducer } from 'spacetimedb/react';
 import { reducers } from './module_bindings';
 
 const createPlayer = useReducer(reducers.createPlayer);
-createPlayer('Alice');
+createPlayer({ name: 'Alice' });
 ```
 
 `useReducer` returns a function that calls the generated reducer. Calls made before the connection is ready are queued and flushed once the connection is established.

skills/concepts/SKILL.md

@@ -20,7 +20,7 @@ SpacetimeDB is a relational database that is also a server. It lets you upload a
 ## Critical Rules
 
 1. **Reducers are transactional.** They do not return data to callers. Use subscriptions to read data.
-2. **Reducers must be deterministic.** No filesystem, network, timers, or random. All state must come from tables.
+2. **Reducers must be deterministic.** Do not use filesystem, network, external clocks, or external random sources in reducers. Use `ReducerContext` for SpacetimeDB-provided timestamp and deterministic random values.
 3. **Read data via tables/subscriptions**, not reducer return values. Clients get data through subscribed queries.
 4. **Auto-increment IDs are not sequential.** Gaps are normal, do not use for ordering. Use timestamps or explicit sequence columns.
 5. **`ctx.sender` is the authenticated principal.** Never trust identity passed as arguments.