The endpoint was returning a 200-line literal dict inline. Moved the
three lists (TRIGGERS, ACTIONS, NOTIFICATIONS) to module-level constants
in core/automation/blocks.py. Route shrinks to 7 lines. Data is now
importable for tests + future docs.
Added 8 shape tests so a typo in the dict (missing 'type', wrong
field type, missing options on a select, etc.) gets caught by CI
instead of breaking the builder UI silently.
The `known_signals` field stays computed at request time via
_collect_known_signals(database) since it's dynamic.
No behavior change. Same response shape. 869 tests passing (was 861).
Ruff clean.
Broque Thomas
a8319156ce