docs(marketplace): README rewrite, scripts audit, stale reference cleanup (v9.1.1)

- README.md fully rewritten: clean domain-grouped plugin tables, accurate
  structure tree matching CANONICAL-PATHS, all 10 scripts and 7 docs listed
- CLAUDE.md structure tree updated to match (was showing only 12 plugins)
- Deleted scripts/check-venv.sh (dead code for unimplemented SessionStart hooks)
- Fixed stale .doc-guardian-queue references in doc-sync.md and sync-workflow.md
- Removed check-venv.sh from CANONICAL-PATHS.md, added missing consumer scripts
- Version bumped to 9.1.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/check-venv.sh

@@ -1,37 +0,0 @@
-#!/usr/bin/env bash
-#
-# check-venv.sh - Check if MCP server venvs exist in installed marketplace
-#
-# Usage: ./scripts/check-venv.sh
-#
-# Exit codes:
-#   0 - All venvs exist (or not installed via marketplace)
-#   1 - Venvs missing, needs setup
-#
-# This script is designed to be called from SessionStart hooks
-# to enable self-healing MCP server setup.
-
-set -euo pipefail
-
-# Installed marketplace location
-MKTPLACE="$HOME/.claude/plugins/marketplaces/leo-claude-mktplace"
-
-# If not installed via marketplace, exit silently
-if [[ ! -d "$MKTPLACE" ]]; then
-    exit 0
-fi
-
-# Check if gitea venv exists
-if [[ ! -f "$MKTPLACE/mcp-servers/gitea/.venv/bin/python" ]]; then
-    echo "SETUP_NEEDED"
-    exit 1
-fi
-
-# Check if netbox venv exists
-if [[ ! -f "$MKTPLACE/mcp-servers/netbox/.venv/bin/python" ]]; then
-    echo "SETUP_NEEDED"
-    exit 1
-fi
-
-# All good
-exit 0