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/control/src/config.ts

@@ -0,0 +1,29 @@
+import { z } from 'zod';
+
+const schema = z.object({
+  NODE_ENV: z.enum(['development', 'production']).default('production'),
+  PORT: z.coerce.number().default(9503),
+  HOST: z.string().default('100.114.205.53'),
+  DATABASE_URL: z.string(),
+  LOG_LEVEL: z.enum(['fatal', 'error', 'warn', 'info', 'debug', 'trace']).default('info'),
+  RETENTION_RAW_HOURS: z.coerce.number().default(48),
+  RETENTION_ROLLUP_DAYS: z.coerce.number().default(90),
+  CAPTURE_SIZE_KB: z.coerce.number().default(256),
+  CAPTURE_BUDGET_MB: z.coerce.number().default(50),
+  LLAMA_PROVIDERS_PATH: z.string().optional(),
+  LLAMA_SWAP_URL: z.string().default('http://localhost:8080'),
+  // P9.1: path to the llama-swap config-schema.json (fork). Defaults to the
+  // copy bundled under dist/data; override to point at the live fork schema.
+  LLAMA_CONFIG_SCHEMA_PATH: z.string().optional(),
+});
+
+export type Config = z.infer<typeof schema>;
+
+export function loadConfig(): Config {
+  const result = schema.safeParse(process.env);
+  if (!result.success) {
+    console.error('Invalid env:', result.error.message);
+    process.exit(1);
+  }
+  return result.data;
+}