fix(6470): a moment proposal counts only opens no hook explained, and asks the reader to judge it

The signal counted every get_rule open against every moment from the
previous three minutes, so a rule a search arm had just shown was
proposed for whatever moment happened to fire. All nine pending signal
proposals were wrong.

- The hook skips an open of a rule a hook named this session, and sends
  the last three acts from 90 seconds instead of 30 from 180.
- A rule already mounted anywhere gathers no signal evidence.
- A signal pair keeps the actions that reached its moment and shows them
  as its why.
- The proposal line says it is co-occurrence, not a recommendation, and
  asks the reader to check the rule against the moment before offering
  it; moments.md says the same.

Plugin 2026.10.26.2029.

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

tests/test_rule_moment_judgments.py

@@ -61,6 +61,29 @@ def test_the_proposal_line_names_the_tool_that_answers_it():
     assert "judge_rule_moments" in line and '"reject"' in line
 
 
+def test_the_proposal_line_is_a_question_to_check_not_advice_to_relay():
+    rule = SimpleNamespace(id=11, title="Definition of done", kind="rule")
+    evidence = {"situations": ["a", "b", "c"],
+                "reached_by": {"git push": 3, "git push --tags": 1}}
+    line = svc._proposal_line(rule, "work.deliver", evidence)
+    assert "co-occurrence, not a recommendation" in line
+    assert "`list_moments`" in line and "if it is about a subject, leave it" in line
+    assert "(reached by `git push`, `git push --tags`)" in line
+    note = svc._signal_note("work.deliver", evidence)
+    assert note.startswith("Opened just after `work.deliver` (reached by `git push`")
+    assert "3 distinct sessions" in note
+
+
+def test_the_actions_a_signal_remembers_are_bounded():
+    ev: dict = {}
+    for i in range(svc._SIGNAL_ACTIONS_CAP + 3):
+        ev = svc._add_reached(ev, f"cmd {i}")
+    ev = svc._add_reached(ev, "cmd 0")
+    assert len(ev["reached_by"]) == svc._SIGNAL_ACTIONS_CAP
+    assert ev["reached_by"]["cmd 0"] == 2
+    assert svc._add_reached({}, "")["reached_by"] == {}
+
+
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