feat(moments): skills and stored processes declare the moments they are for (milestone 458 step 5, #4923)

Loading a procedure now also reaches the moment it is for. Loading the
reporting procedure is a report; loading the release procedure is a delivery.

- Bundled skills: each SKILL.md declares `metadata: moments:`. The same
  declaration ships as Skill defaults (BUNDLED_SKILL_MOMENTS), because the
  server never sees the plugin's files. test_skill_moments holds the two
  together and pins the plugin name that qualifies the skill.
- Stored processes: `moments` on create_process and update_process, stored
  in the note's data and returned by get_process. A `scribe-proc-<slug>`
  load resolves its process through the sync manifest at load time. The
  moments are not copied into the stub, which would go stale mid-session.
- reachable_tools lists the skill loader whenever anything is mounted, since
  a process's moments are known only when it loads.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scribe/services/moment_delivery.py

@@ -17,7 +17,6 @@ from __future__ import annotations
 import logging
 
 from scribe.services import moment_actions
-from scribe.services import moments as catalog
 from scribe.services import retrieval_pipeline as rp
 
 logger = logging.getLogger(__name__)
@@ -39,8 +38,10 @@ async def reachable_tools(user_id: int) -> list[str]:
     What the plugin's catch-all hook reads once per session window, so the
     calls that cannot reach a mounted rule — most of them, and every one on
     an install that has mounted nothing — never leave the machine. An action
-    counts only when its moment carries a mount; the skill loader counts when
-    any `skill.<name>` moment does.
+    counts only when its moment carries a mount. The skill loader counts
+    whenever anything is mounted: a stored process declares its own moments,
+    which only the load itself can resolve, and a load is rare enough that
+    asking costs nothing.
     """
     from scribe.services import rulebooks
 
@@ -53,8 +54,7 @@ async def reachable_tools(user_id: int) -> list[str]:
         for action, _via in moment_actions.effective_actions(mappings)
         if action.moment in mounted
     }
-    if any(name.startswith(catalog.SKILL_PREFIX) for name in mounted):
-        keys.add(moment_actions.SKILL_TOOL)
+    keys.add(moment_actions.SKILL_TOOL)
     return sorted(keys)