chore(automation): trim docstrings to intent only

Cut the docstrings and Field(description=...) text across the entire
automations/ tree down to single-line intent statements, matching the
multi_agent_chat conciseness style:

- Module docstrings: one line stating what the file is.
- Class docstrings: deleted when the class name + module docstring
  already cover intent; kept only where they add a constraint or
  rationale not visible in the signature.
- Pydantic Field descriptions: short noun phrases / clauses, not
  full sentences. Reasoning that belonged in the design plan moved
  out of the code.
- Enum values: per-value docstrings replaced with terse inline
  comments where the meaning isn't obvious from the name.

Behaviour is unchanged. The same 33 files, same public surface, same
imports — verified by re-running the 10-point registry smoke test and
the 8-point schema round-trip / constraint suite from commits 9 and
10.

LOC: 1180 → 691 (-42%).

surfsense_backend/app/automations/registries/actions/__init__.py

@@ -1,4 +1,4 @@
-"""Action registry: ``types.py`` (dataclass), ``store.py`` (dict + register fn)."""
+"""Action registry."""
 
 from __future__ import annotations
 

surfsense_backend/app/automations/registries/actions/store.py

@@ -1,4 +1,4 @@
-"""Action registry: in-memory dict + ``register_action`` API."""
+"""In-memory action registry. Populated once at process startup."""
 
 from __future__ import annotations
 
@@ -8,26 +8,16 @@ _REGISTRY: dict[str, ActionDefinition] = {}
 
 
 def register_action(action: ActionDefinition) -> None:
-    """Add an action to the in-memory registry.
-
-    Raises ``ValueError`` on duplicate ``type`` — registration runs
-    once per process, so a duplicate is always a bug.
-    """
-
+    """Register an action. Raises on duplicate type."""
     if action.type in _REGISTRY:
-        raise ValueError(
-            f"Action already registered: {action.type!r}"
-        )
+        raise ValueError(f"Action already registered: {action.type!r}")
     _REGISTRY[action.type] = action
 
 
 def get_action(action_type: str) -> ActionDefinition | None:
-    """Look up one action by type. Returns ``None`` on miss."""
-
     return _REGISTRY.get(action_type)
 
 
 def all_actions() -> dict[str, ActionDefinition]:
-    """Snapshot of the registry as a defensive copy."""
-
+    """Defensive snapshot of the registry."""
     return dict(_REGISTRY)

surfsense_backend/app/automations/registries/actions/types.py

@@ -1,4 +1,4 @@
-"""``ActionDefinition`` dataclass — the v1-minimum action shape."""
+"""``ActionDefinition`` dataclass and handler signature."""
 
 from __future__ import annotations
 
@@ -7,36 +7,10 @@ from dataclasses import dataclass
 from typing import Any
 
 ActionHandler = Callable[[dict[str, Any]], Awaitable[Any]]
-"""The signature every action handler must satisfy.
-
-Identical in shape to ``CapabilityHandler`` — both receive a
-caller-validated input dict and return an arbitrary output. The
-distinction is purely architectural: capabilities are the low-level
-"what SurfSense can do" surface, actions are the user-facing
-building blocks composed into a plan.
-"""
 
 
 @dataclass(frozen=True, slots=True)
 class ActionDefinition:
-    """A user-facing step type the plan editor can compose.
-
-    v1 trims the dataclass to the five fields necessary for
-    registry dispatch and form rendering. The full design (§4)
-    includes ``output_contract``, ``uses_capabilities``, and
-    ``produces_artifacts``; all three are deferred until a consumer
-    feature requires them:
-
-    - ``output_contract`` — the loose ``agent_task`` action declares
-      its output shape per-step via ``config.output_schema``, so the
-      action-level contract is not needed in v1.
-    - ``uses_capabilities`` — would let the NL generator do static
-      analysis of which capabilities each action invokes; deferred
-      because v1 ships a single (``agent_task``) action.
-    - ``produces_artifacts`` — deferred alongside the artifact
-      pipeline (see §13 decision 26).
-    """
-
     type: str
     name: str
     description: str