fix: e2e/integration test infrastructure and Makefile test targets

- Fix make test: was pointing to non-existent api/tests/, now runs unit tests
  correctly with --ignore=e2e --ignore=integration
- Remove dead phase test targets (test-phase1..4, test-all-phases) that all
  referenced cd api && pytest tests/ (non-existent path)
- Add .test_admin_pass file: reset_admin_password.py now writes a persistent
  test password file alongside .admin_initial_password; the API never deletes
  it (unlike .admin_initial_password which is consumed on first startup)
- Update both integration/conftest.py and e2e/helpers/admin_password.py to
  read .test_admin_pass before .admin_initial_password — so tests work after
  make restart without needing PIC_ADMIN_PASS env var
- Add AI collaboration rules to CLAUDE.md (auto-loaded every session)

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

Makefile

@@ -223,17 +223,18 @@ restore:
 # ── Tests ─────────────────────────────────────────────────────────────────────
 
 test:
-	@echo "Running all tests..."
-	pytest tests/ api/tests/
+	@echo "Running unit tests..."
+	python3 -m pytest tests/ --ignore=tests/e2e --ignore=tests/integration -q
 
-test-all:
-	python3 api/tests/run_tests.py
+test-all: test test-integration test-e2e-api test-e2e-ui
+	@echo "All test suites complete."
 
 test-unit:
-	pytest tests/
+	python3 -m pytest tests/ --ignore=tests/e2e --ignore=tests/integration -q
 
 test-coverage:
-	pytest tests/ api/tests/ --cov=api --cov-report=html --cov-report=term-missing --cov-fail-under=70 -v
+	python3 -m pytest tests/ --ignore=tests/e2e --ignore=tests/integration \
+		--cov=api --cov-report=html --cov-report=term-missing --cov-fail-under=70 -v
 
 test-integration:
 	@echo "Running full integration tests (requires running PIC stack)..."
@@ -244,14 +245,15 @@ test-integration-readonly:
 	PIC_HOST=$${PIC_HOST:-localhost} python3 -m pytest tests/integration/test_live_api.py tests/integration/test_webui.py -v
 
 test-api:
-	cd api && python3 -m pytest tests/test_api_endpoints.py -v
+	python3 -m pytest tests/test_api_endpoints.py -v
 
 test-cli:
-	cd api && python3 -m pytest tests/test_cli_tool.py -v
+	python3 -m pytest tests/test_cli_tool.py -v
 
 # ── E2E tests ─────────────────────────────────────────────────────────────────
 # Run `make test-e2e-deps` once to install dependencies, then use the other targets.
-# WG tests require wg-quick and run under sudo (passwordless sudo assumed on this host).
+# Admin password is read from data/api/.test_admin_pass (written by reset-test-admin-pass).
+# Override: make test-e2e-api PIC_ADMIN_PASS=mypassword
 
 test-e2e-deps:
 	sudo pip3 install --break-system-packages -r tests/e2e/requirements.txt
@@ -282,20 +284,6 @@ show-admin-password:
 reset-admin-password:
 	@sudo python3 scripts/reset_admin_password.py --generate
 
-test-phase1:
-	cd api && python3 -m pytest tests/test_network_manager.py tests/test_phase1_endpoints.py -v
-
-test-phase2:
-	cd api && python3 -m pytest tests/test_wireguard_manager.py tests/test_phase2_endpoints.py -v
-
-test-phase3:
-	cd api && python3 -m pytest tests/test_phase3_managers.py tests/test_phase3_endpoints.py -v
-
-test-phase4:
-	cd api && python3 -m pytest tests/test_phase4_routing.py tests/test_phase4_endpoints.py -v
-
-test-all-phases:
-	cd api && python3 -m pytest tests/ -v
 
 # ── Network / peers ───────────────────────────────────────────────────────────