chore: snapshot working tree - pty_exited notifications + in-flight inference WIP

feat(booterm): structured pty_exited WS notifications. Plan-validated, impl-validated, code-reviewed green (contracts build clean, contracts test 29/29, booterm + web typecheck clean).

wip: in-progress inference/provider refactor (agents.ts, provider.ts, new llama-providers.ts, removed llama-args-validator), plus arena, dispatcher, compaction, schema changes.

openspec: pty-exit-notifications complete; x-agent-flags planned (not yet implemented).

apps/server/src/config.ts

@@ -25,7 +25,6 @@ const ConfigSchema = z.object({
   // session model (auto_name) or DEFAULT_MODEL when unset.
   FAST_MODEL: z.string().optional(),
   TASK_MODEL_URL: z.string().url().optional(),
-  LLAMA_SIDECAR_URL: z.string().url().optional(),
   // vDeepSeek: DeepSeek API key for direct API access. When set, models
   // with IDs starting with 'deepseek-' route through DeepSeek's API instead
   // of llama-swap. Defaults to empty (DeepSeek routing disabled).
@@ -34,6 +33,11 @@ const ConfigSchema = z.object({
   DEEPSEEK_BASE_URL: z.string().url().default('https://api.deepseek.com'),
   // vWhale hooks: path to hooks JSON config file. Missing file = no hooks.
   HOOKS_CONFIG_PATH: z.string().default('/data/hooks.json'),
+  // vMultiProvider: path to the local providers config JSON file. Missing file
+  // = legacy synthesis from LLAMA_SWAP_URL.
+  LLAMA_PROVIDERS_PATH: z.string().optional(),
+  // BooControl host service origin. Used by /api/control/* proxy routes.
+  BOOCONTROL_URL: z.string().url().optional(),
 });
 
 export type Config = z.infer<typeof ConfigSchema>;