refactor: rename factory/ → supervisor/, factory-poll → supervisor-poll

The supervisor agent was confusingly named "factory" (same as the
project). Rename directory, script, log, lock, status, and escalation
files. Update all references across scripts and docs.

FACTORY_ROOT env var unchanged (refers to project root, not agent).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supervisor/update-prompt.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# update-prompt.sh — Append a lesson to a best-practices file
+#
+# Usage:
+#   ./supervisor/update-prompt.sh "best-practices/memory.md" "### Title\nBody text"
+#   ./supervisor/update-prompt.sh --from-file "best-practices/memory.md" /tmp/lesson.md
+#
+# Called by claude -p when it learns something during a fix.
+# Commits and pushes the update to the disinto repo.
+
+source "$(dirname "$0")/../lib/env.sh"
+
+TARGET_FILE="${FACTORY_ROOT}/supervisor/$1"
+shift
+
+if [ "$1" = "--from-file" ] && [ -f "$2" ]; then
+  LESSON=$(cat "$2")
+elif [ -n "$1" ]; then
+  LESSON="$1"
+else
+  echo "Usage: update-prompt.sh <relative-path> '<lesson text>'" >&2
+  echo "   or: update-prompt.sh <relative-path> --from-file <path>" >&2
+  exit 1
+fi
+
+if [ ! -f "$TARGET_FILE" ]; then
+  echo "Target file not found: $TARGET_FILE" >&2
+  exit 1
+fi
+
+# Append under "Lessons Learned" section if it exists, otherwise at end
+if grep -q "## Lessons Learned" "$TARGET_FILE"; then
+  echo "" >> "$TARGET_FILE"
+  echo "$LESSON" >> "$TARGET_FILE"
+else
+  echo "" >> "$TARGET_FILE"
+  echo "## Lessons Learned" >> "$TARGET_FILE"
+  echo "" >> "$TARGET_FILE"
+  echo "$LESSON" >> "$TARGET_FILE"
+fi
+
+cd "$FACTORY_ROOT"
+git add "supervisor/$1" 2>/dev/null || git add "$TARGET_FILE"
+git commit -m "supervisor: learned — $(echo "$LESSON" | head -1 | sed 's/^#* *//')" --no-verify 2>/dev/null
+git push origin main 2>/dev/null
+
+log "Updated $(basename "$TARGET_FILE") with new lesson"