feat(operator): wire operator management surface

[BruceLoveDecimal]

Summary

• add a reusable OperatorRuntimeManagementSurface for read-only runtime/provider/daemon/skills/tools/security inspection
• wire tool.operator.inspect and tool.operator.manage to real CLI and API adapters
• support confirmed skill enable/disable, provider.set_default, and daemon.restart plans with receipts and redaction
• document the elephant-operator skill safety surface and add unit coverage for the operator paths

Validation

• PASS: .venv/bin/python -m unittest tests.unit.operator.test_operator_runtime tests.unit.test_operator_tools tests.unit.cli.test_operator_surface tests.unit.api.test_operator_surface tests.integration.tools_skills.test_tools_and_skills_runtime
• PASS: make agent-fast-gate PYTHON=.venv/bin/python CHANGED_FILES="apps/api/api_runtime_impl.py apps/api/operator_surface.py apps/cli/operator_surface.py apps/cli/runtime_extensions_surface.py packages/operator/init.py packages/operator/management.py packages/skills/builtin_packages/runtime/elephant-operator/SKILL.md packages/tools/builtins_operator.py tests/unit/api/test_operator_surface.py tests/unit/cli/test_operator_surface.py tests/unit/operator/test_operator_runtime.py tests/unit/test_operator_tools.py"
• FAIL: make test-integration-scenarios PYTHON=.venv/bin/python has existing non-operator failures in models_auth and companion scenarios: UrllibJSONHTTPTransport._error_message missing, Episode.session_id missing, provider auth metadata missing, system layer heading mismatch, and openai streaming expectation mismatch
• Not rerun this turn: make test-e2e. Previous full run only failed test_launcher_dashboard_guides_to_daemon_surface because a built dashboard dist lets elephant dashboard --skip-build auto-start the daemon and return 0

Closes #6

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