feat: add Claude Code releases tracking

Add condensed release history for Claude Code product (v2.0.24 → v2.1.12)

New files:
- machine-readable/claude-code-releases.yaml: Source of truth (YAML)
- guide/claude-code-releases.md: Human-readable changelog
- scripts/update-cc-releases.sh: Check for new releases from GitHub

Modified:
- reference.yaml: Add deep_dive entries for releases
- check-landing-sync.sh: Add CC version check (#5)
- README.md, guide/README.md: Add navigation links
- CLAUDE.md: Document update workflow

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/check-landing-sync.sh

@@ -130,6 +130,26 @@ else
 fi
 echo ""
 
+# ===================
+# 5. CLAUDE CODE VERSION
+# ===================
+CC_VERSION=$(grep "^latest:" "$GUIDE_DIR/machine-readable/claude-code-releases.yaml" | cut -d'"' -f2)
+# Landing may show this in a badge or section - check if exists
+LANDING_CC_VERSION=$(grep -oE 'Claude Code v[0-9]+\.[0-9]+\.[0-9]+' "$LANDING_DIR/index.html" 2>/dev/null | head -1 | sed 's/Claude Code v//' || echo "N/A")
+
+echo -e "${BLUE}5. Claude Code Version${NC}"
+echo "   Releases YAML: $CC_VERSION"
+echo "   Landing:       ${LANDING_CC_VERSION:-Not displayed}"
+if [ "$LANDING_CC_VERSION" = "N/A" ] || [ -z "$LANDING_CC_VERSION" ]; then
+    echo -e "   ${YELLOW}INFO${NC}: Landing doesn't display CC version (optional)"
+elif [ "$CC_VERSION" != "$LANDING_CC_VERSION" ]; then
+    echo -e "   ${YELLOW}MISMATCH${NC} → Update index.html CC version badge"
+    # Not counting as hard error since it's optional
+else
+    echo -e "   ${GREEN}OK${NC}"
+fi
+echo ""
+
 # ===================
 # SUMMARY
 # ===================

scripts/update-cc-releases.sh

@@ -0,0 +1,84 @@
+#!/bin/bash
+# Fetch latest Claude Code releases and show diff
+# Usage: ./scripts/update-cc-releases.sh
+#
+# This script fetches the official CHANGELOG and shows new versions
+# You then manually add the condensed entries to claude-code-releases.yaml
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_DIR="$(dirname "$SCRIPT_DIR")"
+RELEASES_FILE="$REPO_DIR/machine-readable/claude-code-releases.yaml"
+CHANGELOG_URL="https://raw.githubusercontent.com/anthropics/claude-code/main/CHANGELOG.md"
+TMP_FILE="/tmp/claude-code-changelog.md"
+
+# Colors
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m'
+
+echo "=== Claude Code Releases Update ==="
+echo ""
+
+# Get current version from our YAML
+CURRENT_VERSION=$(grep "^latest:" "$RELEASES_FILE" | cut -d'"' -f2)
+echo -e "${BLUE}Current tracked version:${NC} $CURRENT_VERSION"
+
+# Fetch latest CHANGELOG
+echo -e "${BLUE}Fetching official CHANGELOG...${NC}"
+curl -sL "$CHANGELOG_URL" -o "$TMP_FILE"
+
+if [ ! -s "$TMP_FILE" ]; then
+    echo "ERROR: Failed to fetch CHANGELOG"
+    exit 1
+fi
+
+# Extract latest version from CHANGELOG (format: "## X.Y.Z")
+LATEST_VERSION=$(grep -oE "^## [0-9]+\.[0-9]+\.[0-9]+" "$TMP_FILE" | head -1 | sed 's/## //')
+echo -e "${BLUE}Latest official version:${NC} $LATEST_VERSION"
+echo ""
+
+# Compare versions
+if [ "$CURRENT_VERSION" = "$LATEST_VERSION" ]; then
+    echo -e "${GREEN}✓ Already up to date!${NC}"
+    rm -f "$TMP_FILE"
+    exit 0
+fi
+
+echo -e "${YELLOW}⚠ New versions available!${NC}"
+echo ""
+
+# Show new versions (between current and latest)
+echo -e "${BLUE}New releases since $CURRENT_VERSION:${NC}"
+echo "────────────────────────────────────────"
+
+# Extract versions newer than current
+awk -v current="$CURRENT_VERSION" '
+    /^## [0-9]+\.[0-9]+\.[0-9]+/ {
+        match($0, /[0-9]+\.[0-9]+\.[0-9]+/)
+        ver = substr($0, RSTART, RLENGTH)
+        if (ver == current) exit
+        in_version = 1
+        print ""
+        print $0
+        next
+    }
+    in_version { print }
+' "$TMP_FILE" | head -100
+
+echo ""
+echo "────────────────────────────────────────"
+echo ""
+echo -e "${BLUE}Next steps:${NC}"
+echo "1. Review the changes above"
+echo "2. Add condensed entries to: machine-readable/claude-code-releases.yaml"
+echo "3. Update guide/claude-code-releases.md"
+echo "4. Update 'latest' and 'updated' fields"
+echo "5. Run: ./scripts/check-landing-sync.sh"
+echo ""
+echo -e "${BLUE}Full CHANGELOG saved to:${NC} $TMP_FILE"
+echo ""
+echo "Tip: Use Claude to help condense the entries:"
+echo "  claude -p \"Condense these release notes for claude-code-releases.yaml: \$(cat $TMP_FILE | head -200)\""