Add bash_kill, background job eviction, and configurable request timeout

Bump to 0.3.0.

- bash_kill tool lets the model terminate a still-running backgrounded
  job (Ctrl+B); all running jobs are killed on process exit so they
  don't outlive locode as orphans.
- Finished background jobs are now evicted from the registry after a
  10-minute TTL instead of accumulating for the life of the session.
- The chat completion request timeout is now configurable
  (requestTimeoutMs / LOCODE_REQUEST_TIMEOUT_MS, default 180000) so
  backends that queue requests behind a concurrency limit (e.g.
  Ollama's OLLAMA_NUM_PARALLEL) under multi-session load aren't forced
  into a hard failure at a fixed 3 minutes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/cli.ts

@@ -114,7 +114,7 @@ configCmd
 
 configCmd
   .command("set <key> <value>")
-  .description("Persist a config value (backend, model, baseUrl, contextWindow, maxIterations, autoCompactThreshold)")
+  .description("Persist a config value (backend, model, baseUrl, contextWindow, maxIterations, autoCompactThreshold, requestTimeoutMs)")
   .action((key: string, value: string) => {
     if (
       key !== "backend" &&
@@ -122,9 +122,12 @@ configCmd
       key !== "baseUrl" &&
       key !== "contextWindow" &&
       key !== "maxIterations" &&
-      key !== "autoCompactThreshold"
+      key !== "autoCompactThreshold" &&
+      key !== "requestTimeoutMs"
     ) {
-      console.error(`Unknown config key "${key}". Valid keys: backend, model, baseUrl, contextWindow, maxIterations, autoCompactThreshold`);
+      console.error(
+        `Unknown config key "${key}". Valid keys: backend, model, baseUrl, contextWindow, maxIterations, autoCompactThreshold, requestTimeoutMs`,
+      );
       process.exit(1);
     }
     const stored = loadStoredConfig();
@@ -142,6 +145,13 @@ configCmd
         process.exit(1);
       }
       stored[key] = n;
+    } else if (key === "requestTimeoutMs") {
+      const n = Number(value);
+      if (!Number.isFinite(n) || n < 10_000 || n > 1_800_000) {
+        console.error(`requestTimeoutMs must be between 10000 and 1800000, got "${value}".`);
+        process.exit(1);
+      }
+      stored[key] = n;
     } else {
       stored[key] = value;
     }