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>

plugin/hooks/scribe_moment.sh

@@ -16,10 +16,10 @@
 # other tool costs one file read. An install that has mounted nothing gets an
 # empty list and never sends a moment request at all.
 #
-# SCRIBE'S OWN TOOLS ARE SKIPPED. Closing a task or recording a lesson reaches
-# its moment through the tool's own response (`moment_rules`), which works for
-# a client without this plugin too; delivering it here as well would say it
-# twice.
+# SCRIBE'S OWN TOOLS ARE SKIPPED for delivery. Closing a task or recording a
+# lesson reaches its moment through the tool's own response (`moment_rules`),
+# which works for a client without this plugin too; delivering it here as well
+# would say it twice. They are still written to the acts ledger below.
 #
 # SILENT ON OUTAGE, like scribe_tool_rules.sh and for its reason: this fires
 # before many calls, and an outage line before each is noise. A failed list
@@ -42,10 +42,6 @@ event_cwd=$(scribe_json_pick "$event_flat" '.cwd')
 
 [ -n "$tool_name" ] && [ -n "$session_id" ] || exit 0
 
-case "$tool_name" in
-  mcp__*scribe*__*) exit 0 ;;
-esac
-
 scribe_config || exit 0
 
 # The tool's KEY, as the server writes mappings: no MCP server prefix, lowercase.
@@ -56,16 +52,48 @@ state_dir="${TMPDIR:-/tmp}/scribe-priorart"
 mkdir -p "$state_dir" 2>/dev/null || true
 safe_sid=$(printf '%s' "$session_id" | tr -c 'A-Za-z0-9._-' '_')
 
+# Its own directory, outside SCRIBE_LEDGER_DIRS, so a compaction does not
+# sweep it: what is kept here describes the install and what the session
+# DID, not what its context holds. scribe_session_end.sh removes it.
+cache_dir="${TMPDIR:-/tmp}/scribe-moment"
+mkdir -p "$cache_dir" 2>/dev/null || true
+now=$(date +%s 2>/dev/null) || now=0
+
+# ── The acts ledger (milestone 458 step 7) ────────────────────────────────
+#
+# Every call, before any filter: `epoch<TAB>event`, one line each. When the
+# session then opens a rule, scribe_record_opened.sh sends the last few
+# minutes of these, and the server counts the open as evidence the rule
+# belongs on the moments they reached — which is how a rule nobody mounted
+# gets proposed for one. Recorded whether or not anything is mounted, since
+# an unmounted moment is exactly what the evidence is for, and including
+# Scribe's own tools (closing a task is a moment too). The open itself is
+# not an act. A large event (a file write) is kept as its tool name alone.
+if [ "$now" -gt 0 ] && [ "$tool_key" != "get_rule" ]; then
+  acts_file="$cache_dir/${safe_sid}.acts"
+  act=$(printf '%s' "$event" | tr -d '\n\r')
+  if [ "${#act}" -gt 16384 ]; then
+    esc=$(printf '%s' "$tool_name" | scribe_json_escape) || esc=""
+    act="{\"tool_name\":\"${esc}\",\"tool_input\":{}}"
+  fi
+  printf '%s\t%s\n' "$now" "$act" >> "$acts_file" 2>/dev/null || true
+  # Kept short: only the last few minutes are ever read.
+  size=$(wc -c < "$acts_file" 2>/dev/null) || size=0
+  if [ "${size:-0}" -gt 262144 ]; then
+    tail -n 50 "$acts_file" > "$acts_file.tmp" 2>/dev/null \
+      && mv -f "$acts_file.tmp" "$acts_file" 2>/dev/null
+  fi
+fi
+
+case "$tool_name" in
+  mcp__*scribe*__*) exit 0 ;;
+esac
+
 # ── Which tools can reach a mounted rule: cached, first line a timestamp ──
 #
 # Five minutes. A mount or a mapping made in this session reaches the hook
 # within that window; the MCP door delivers Scribe's own moments at once.
-# Its own directory, outside SCRIBE_LEDGER_DIRS, so a compaction does not
-# sweep it: it describes the install, not what this context holds.
-cache_dir="${TMPDIR:-/tmp}/scribe-moment"
-mkdir -p "$cache_dir" 2>/dev/null || true
 tools_file="$cache_dir/${safe_sid}.tools"
-now=$(date +%s 2>/dev/null) || now=0
 stamp=""
 [ -f "$tools_file" ] && stamp=$(head -n 1 "$tools_file" 2>/dev/null)
 case "$stamp" in ''|*[!0-9]*) stamp=0 ;; esac