Add agent skill (SKILL.md + per-domain reference)

skills/rudder-web-sdk/reference/remote-config.md

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+# Remote config — `client.remoteConfig`
+
+`ConfigDomain<TConfig>` (source: `src/domains/ConfigDomain.ts`, base class
+`src/state/RemoteConfigState.ts`) — typed remote configuration as an
+observable entity. Synced under revision key `config`.
+
+## Typed access
+
+```ts
+interface GameConfig extends Record<string, unknown> {
+  player_speed: number;
+  feature_x: boolean;
+}
+
+const client = new RudderClient<GameConfig>({ baseUrl, projectKey });
+
+client.remoteConfig.get('player_speed', 200);  // number
+client.remoteConfig.get('feature_x');          // boolean | undefined
+```
+
+`get()` overloads:
+
+```ts
+get(key): TConfig[key] | undefined;
+get(key, defaultValue: TConfig[key]): TConfig[key];
+```
+
+- Values are parsed synchronously from the loaded snapshot according to the
+  config's server-declared `valueType`.
+- Returns the default value (or `undefined`) while not loaded, for unknown
+  keys, and when parsing fails.
+- Parsing rules: `int`/`integer` → `parseInt`; `float`/`double`/`number` →
+  `parseFloat`; `bool`/`boolean` → `value === 'true'`; `json`/`object` →
+  `JSON.parse`; anything else → raw string.
+
+## Observable
+
+```ts
+client.remoteConfig.data      // Map<string, RemoteConfig> | undefined
+client.remoteConfig.onChange(cb);   // fires immediately
+await client.remoteConfig.reload();
+```
+
+```ts
+interface RemoteConfig {
+  active?: boolean; createdAt?: string; description?: string;
+  environment?: string; id?: string; key?: string; projectId?: string;
+  updatedAt?: string; value?: string;
+  valueType?: 'bool' | 'float' | 'int' | 'json' | 'string';
+}
+```
+
+Only configs that are not explicitly `active: false` enter the map (the server
+already filters inactive configs out and may omit the flag).
+
+## Behavior notes
+
+- Warmed at login.
+- Scenario `remote_config_override` nodes patch the local snapshot and fire
+  `client.effects.onConfigChanged({ key })` — the patched value is what
+  `get()` returns afterwards.
+- Without a `TConfig` type argument, `RemoteConfigShape` defaults to
+  `Record<string, unknown>` and `get()` returns `unknown`.