fix: remove invalid show_tool_calls kwarg crashing Agent init (#157)

* fix: remove invalid show_tool_calls kwarg crashing Agent init (regression)

show_tool_calls was removed in f95c960 (Feb 26) because agno 2.5.x
doesn't accept it, then reintroduced in fd0ede0 (Mar 8) without
runtime testing — mocked tests hid the breakage.

Replace the bogus assertion with a regression guard and an allowlist
test that catches unknown kwargs before they reach production.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: auto-install git hooks, add black/isort to dev deps

- Add .githooks/ with portable pre-commit hook (macOS + Linux)
- make install now auto-activates hooks via core.hooksPath
- Add black and isort to poetry dev group (were only in CI via raw pip)
- Fix black formatting on 2 files flagged by CI
- Fix test_autoresearch_perplexity patching wrong module path

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Trip T <trip@local>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/dashboard/routes/agents.py

@@ -66,6 +66,7 @@ async def chat_agent(request: Request, message: str = Form(...)):
     message = message.strip()
     if not message:
         from fastapi import HTTPException
+
         raise HTTPException(status_code=400, detail="Message cannot be empty")
 
     timestamp = datetime.now().strftime("%H:%M:%S")

src/timmy/agent.py

@@ -278,7 +278,6 @@ def create_timmy(
         num_history_runs=20,
         markdown=True,
         tools=[tools] if tools else None,
-        show_tool_calls=True if use_tools else False,
         tool_call_limit=settings.max_agent_steps if use_tools else None,
         telemetry=settings.telemetry_enabled,
     )