docs(plugin): the instruction surfaces teach moments - reading a line that arrived at one, correcting a misfire, and giving a new rule its moments (milestone 458 step 8, #4926)

Until now only the tool arguments knew moments existed. The guidance
surfaces described rules as reached by resemblance alone:

- using-scribe: a short reflex paragraph and a new reference file,
  moments.md. It covers reading "at <moment>, reached by <action>", the
  reply held once at reply.report, map_action / unmap_action offered in
  one line, and the step 7 proposal line answered with judge_rule_moments.
- writing-records: asks WHEN a rule applies as well as what it is about.
  A rule, preference or process about a point in the work gets
  moments=[...] as it is written, and the trigger stays as the net.
- missed-retrieval: a missed WHEN is mounted or mapped, not reworded. A
  misfire is unmounted or unmapped.
- _INSTRUCTIONS: one clause (list_moments; mount rules about WHEN),
  1594 of 1600 chars.
- static context: injected lines include the rules mounted on a moment
  that was reached.
- test_guidance_ownership: three owned topics, so the text cannot quietly
  drop out.

Plugin minted.

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

tests/test_guidance_ownership.py

@@ -185,6 +185,19 @@ TOPICS: tuple[Topic, ...] = (
     Topic("where a new rule goes, and its trigger", U, ("create_project_rule", "when_to_apply"),
           "whichever home it gets"),
     Topic("a rule vs the other entities", U, ("standing instruction",), "first ask whether it's a rule at all"),
+    # Moments (milestone 458 step 8). Delivery at a moment and its in-session
+    # corrections are owned by using-scribe's moments.md; the index carries one
+    # clause, and a new rule's moments are asked where its home and trigger are.
+    Topic("rules mounted on a moment arrive by lookup; correct a misfire in-session", U,
+          ("list_moments", "map_action", "unmap_action", "judge_rule_moments"),
+          "it belongs in the session that noticed, not on a settings page",
+          index=("list_moments", "moment")),
+    Topic("a new rule about when gets its moments as it is written", U,
+          ("moments=[...]", "create_process(moments="),
+          "then ask when it applies, as well as what it is about"),
+    Topic("a missed when is mounted or mapped, not reworded", U,
+          ("update_rule(moments=",),
+          "first ask whether it missed a when or a what"),
     # Milestone 416 step 9: the tuning tools shipped in #4102/#4104 and were
     # named on NO instruction surface — measured, `retrieval_tuning_history`
     # returned zero events. Machinery with no route to it.