refactor(stall_watch): work out the herdr name once, in StallWatch (Issue #71)

StallWatch converts --target once and hands the name to HerdrSource, so
agent get/read/prompt and agent wait cannot call herdr by different names.

Refs #71

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

.agents/skills/lib_py/stall_watch.py

@@ -155,11 +155,12 @@ class HerdrError(Exception):
 class HerdrSource(object):
     """Every herdr and OS read the judgement needs, in one place."""
 
-    def __init__(self, target, agent, session=None):
+    def __init__(self, target, agent, session=None, name=None):
         self.target, self.session = target, session or None
-        # herdr knows the agent only by its sanitized name (#66); the kind is
-        # read off the original name, whose suffix a long name's hash replaces.
-        self.name = sanitize_herdr_agent_name(target)
+        # `name` is the name herdr knows the agent by (#66), worked out once
+        # by StallWatch (#71); the kind is read off the original name, whose
+        # suffix a long name's hash replaces.
+        self.name = name or target
         self.agent = resolve_agent(agent, target)
         adapter = get_adapter(self.agent) if self.agent else None
         self.resident = tuple(adapter.resident_children) if adapter else ()
@@ -225,8 +226,8 @@ class HerdrSource(object):
 class StallWatch(object):
     def __init__(self, args, source=None):
         self.args = args
-        self.src = source or HerdrSource(args.target, args.agent, args.herdr_session)
         self.herdr_name = sanitize_herdr_agent_name(args.target)  # for herdr only; logs keep args.target
+        self.src = source or HerdrSource(args.target, args.agent, args.herdr_session, name=self.herdr_name)
         name = resolve_agent(args.agent, args.target)
         adapter = get_adapter(name) if name else None
         reliable = bool(adapter.agent_status_reliable) if adapter else True