feat(moments): mount the corpus by proposal - a pass and an open-after-moment signal, both stopping at the operator (milestone 458 step 7, #4925)

A rule written before moments existed is mounted on nothing. Step 7 records,
per (rule, moment), whether it belongs there and who said so:

- rule_moment_judgments (migration 0118, backup v23): suggested / confirmed /
  rejected, from a pass, the signal, or an edit. Moment "" is "no moment fits".
- The pass: rules_to_mount lists unjudged rules; propose_rule_moments records
  suggestions that mount nothing; rule_moment_proposals and
  judge_rule_moments put them to the operator. A confirm mounts, a reject is
  kept so the pair is never proposed again. Same service behind REST and a
  "Waiting on you" panel in Settings > Moments.
- Edits are judgments: set_rule_moments, the one mount write path, confirms
  what was added and rejects what was removed in the same transaction.
- The signal: scribe_moment.sh keeps a per-session acts ledger; when a rule
  is opened, scribe_record_opened.sh sends the last three minutes of it to
  /api/plugin/rule-opened. The acts resolve through the install's mappings;
  work.run and work.change are not evidence. Counted per distinct session
  with lesson_rules' evidence model, and once due the open returns one line
  asking the reader to offer the mount.
- scribe_session_end.sh removes the session's scribe-moment files.

Plugin 2026.10.05.2003.

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

frontend/src/components/MomentsSettings.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { computed, onMounted, ref } from "vue";
 import { useMomentsStore } from "@/stores/moments";
+import MomentProposals from "@/components/MomentProposals.vue";
 import type { MomentAction, MomentUsage } from "@/api/moments";
 import { fmtDate } from "@/utils/dateFormat";
 
@@ -123,6 +124,8 @@ onMounted(() => store.load(true));
         The mount counts could not be read, so they are missing below — not zero.
       </p>
 
+      <MomentProposals />
+
       <ul class="moment-list">
         <li v-for="m in catalog" :key="m.name" class="moment-row">
           <div class="moment-head">