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>

.githooks/pre-commit

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+# Pre-commit hook: lint + test with a wall-clock limit.
+# Blocks the commit if formatting, imports, or tests fail.
+# Current baseline: ~18s wall-clock. Limit set to 30s for headroom.
+#
+# Auto-activated by `make install` via git core.hooksPath.
+
+set -e
+
+echo "Auto-formatting (black + isort)..."
+poetry run black --line-length 100 src/ tests/ --quiet
+poetry run isort --profile black --line-length 100 src/ tests/ --quiet 2>/dev/null
+git add -u
+
+MAX_SECONDS=30
+
+echo "Running tests (${MAX_SECONDS}s limit)..."
+
+# macOS lacks GNU timeout; use perl as a portable fallback.
+if command -v timeout &>/dev/null; then
+    timeout "${MAX_SECONDS}" poetry run pytest tests -q --tb=short --timeout=10
+else
+    perl -e "alarm ${MAX_SECONDS}; exec @ARGV" -- poetry run pytest tests -q --tb=short --timeout=10
+fi
+exit_code=$?
+
+if [ "$exit_code" -eq 142 ] || [ "$exit_code" -eq 124 ]; then
+    echo ""
+    echo "BLOCKED: tests exceeded ${MAX_SECONDS}s wall-clock limit."
+    echo "Speed up slow tests before committing."
+    exit 1
+elif [ "$exit_code" -ne 0 ]; then
+    echo ""
+    echo "BLOCKED: tests failed."
+    exit 1
+fi