feat(processes): MCP create/list/get/update_process tools

Task 2 of #582. New mcp/tools/processes.py mirrors entities.py — tools wrap
notes_svc directly. get_process is the fire mechanism (returns the full prompt
via resolve_process; surfaces other_matches on an ambiguous name). Registered
in register_all.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/fabledassistant/mcp/tools/__init__.py

@@ -5,7 +5,7 @@ to a FastMCP instance. `register_all(mcp)` is the single entry point called
 from `mcp.server.build_mcp_server`.
 """
 from fabledassistant.mcp.tools import (
-    entities, events, milestones, notes, projects, recent, rulebooks, search, tags, tasks, trash,
+    entities, events, milestones, notes, processes, projects, recent, rulebooks, search, tags, tasks, trash,
 )
 
 
@@ -20,5 +20,6 @@ def register_all(mcp) -> None:
     tags.register(mcp)
     recent.register(mcp)
     entities.register(mcp)
+    processes.register(mcp)
     rulebooks.register(mcp)
     trash.register(mcp)