Merge upstream v2.40.0 with local fork additions preserved

Incorporates 163 upstream commits (origin/main) while preserving all
local skills, agents, and commands. Metadata descriptions updated to
reflect actual component counts (30 agents, 56 skills, 7 commands).
file-todos/SKILL.md merged with both upstream command rename and local
assessment fields.

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

plugins/compound-engineering/skills/proof-push/scripts/proof_push.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# Push a markdown file to a running Proof server and return the document URL.
+# Usage: proof_push.sh <path-to-markdown> [server-url]
+set -euo pipefail
+
+FILE="${1:?Usage: proof_push.sh <markdown-file> [server-url]}"
+SERVER="${2:-http://localhost:4000}"
+UI_URL="${3:-http://localhost:3000}"
+
+if [[ ! -f "$FILE" ]]; then
+  echo "error: file not found: $FILE" >&2
+  exit 1
+fi
+
+TITLE=$(basename "$FILE" .md)
+
+RESPONSE=$(curl -s -X POST "${SERVER}/share/markdown" \
+  -H "Content-Type: application/json" \
+  -d "$(jq -n --arg md "$(cat "$FILE")" --arg title "$TITLE" '{markdown: $md, title: $title}')")
+
+SLUG=$(echo "$RESPONSE" | jq -r '.slug // empty')
+ERROR=$(echo "$RESPONSE" | jq -r '.error // empty')
+
+if [[ -z "$SLUG" ]]; then
+  echo "error: failed to create document${ERROR:+: $ERROR}" >&2
+  echo "$RESPONSE" >&2
+  exit 1
+fi
+
+TOKEN_PATH=$(echo "$RESPONSE" | jq -r '.tokenPath // empty')
+
+echo "slug: $SLUG"
+echo "url: ${UI_URL}/d/${SLUG}"
+[[ -n "$TOKEN_PATH" ]] && echo "editor-url: ${UI_URL}${TOKEN_PATH}"