feat: enable parallel tool call batching

- Fix mangled system prompt rule 3 — now explicitly instructs batching
- Add parallel_tool_calls: true to API body (required by many providers)
- Strengthen batching language: #1 speed optimization, NEVER serialize

src/bot/index.js

@@ -76,7 +76,10 @@ function buildSystemPrompt(svc) {
     '   - Fetch URLs: Use `browser` or `web_fetch` (NOT curl/wget)',
     '   Use bash ONLY for: tests, installs, git, systemctl, and commands no tool covers.',
     '   Violating this rule wastes turns and bypasses caching.',
-    '   tool calls in a single turn. Example: reading 3 files = 3 parallel calls in 1 turn, NOT 3 turns.',
+    '3. **BATCH independent calls.** ALWAYS emit multiple independent tool calls in a single turn.',
+    '   Reading 3 files = 3 parallel calls in 1 turn, NOT 3 sequential turns.',
+    '   Searching 2 patterns + reading 1 file = 3 calls in 1 turn. This is the #1 speed optimization.',
+    '   NEVER serialize independent operations — the runtime executes them concurrently via Promise.all.',
     '4. **No ghost chasing.** If a command fails (wrong path, file not found), do NOT retry the',
     '   same command. Use `glob` or `ls` to find the correct path, then proceed.',
     '5. **Plan before acting.** For tasks requiring 3+ tool calls, think through the optimal sequence',
@@ -551,6 +554,7 @@ export async function initBot(config, api, tools, skills, agents) {
         messages: loopMessages,
         temperature: opts.temperature ?? 0.7,
         max_tokens: opts.maxTokens || 8192,
+        parallel_tool_calls: true,
       };
       if (toolSchemas.length) body.tools = toolSchemas;