fix(ci): address critical workflow and validation issues

Addresses code review feedback on PR #418:

CRITICAL FIXES:
1. Workflow trigger: Changed from release:published to push:tags
   - Enables "tag and publish in one step" workflow as intended
   - Automatically creates GitHub release on tag push
   - Removed redundant if condition (filtering now via trigger)
   - Added prerelease detection based on tag (-alpha, -beta, -rc)

2. Server path: Explicitly pass server_dir to make command
   - Fixes path mismatch between local (../../server) and CI
   - Uses absolute path: server_dir=${{ github.workspace }}/server
   - Prevents signing failures in GitHub Actions

3. Regex validation: Added test script for commitizen patterns
   - Validates scope filtering works correctly
   - Tests all three components: mcp, helm, astrolabe
   - Tests unscoped commits (default to mcp)
   - Tests breaking changes and invalid commits
   - Location: scripts/test-commitizen-scopes.sh

WORKFLOW IMPROVEMENTS:
- Release creation now automatic on tag push
- Better step naming for clarity
- Consistent prerelease handling across GitHub and App Store
- Explicit server_dir prevents reliance on fragile relative paths

All 16 test cases pass for scope filtering patterns.

scripts/test-commitizen-scopes.sh

@@ -0,0 +1,102 @@
+#!/bin/bash
+# Test commitizen scope filtering patterns
+set -uo pipefail
+
+echo "Testing commitizen scope filtering patterns..."
+echo
+
+# Regex patterns from configs
+MCP_PATTERN='^(feat|fix|docs|refactor|perf|test|build|ci|chore)(\(mcp\))?(!)?:'
+HELM_PATTERN='^(feat|fix|docs|refactor|perf|test|build|ci|chore)\(helm\)(!)?:'
+ASTROLABE_PATTERN='^(feat|fix|docs|refactor|perf|test|build|ci|chore)\(astrolabe\)(!)?:'
+
+test_pattern() {
+    local message="$1"
+    local pattern="$2"
+
+    if echo "$message" | grep -qE "$pattern"; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+run_test() {
+    local message="$1"
+    local expected="$2"
+    local matched_components=()
+
+    # Check which components match
+    if test_pattern "$message" "$MCP_PATTERN"; then
+        matched_components+=("mcp")
+    fi
+    if test_pattern "$message" "$HELM_PATTERN"; then
+        matched_components+=("helm")
+    fi
+    if test_pattern "$message" "$ASTROLABE_PATTERN"; then
+        matched_components+=("astrolabe")
+    fi
+
+    # Convert array to space-separated string, or "none" if empty
+    local matched
+    if [ ${#matched_components[@]} -eq 0 ]; then
+        matched="none"
+    else
+        matched="${matched_components[*]}"
+    fi
+
+    # Validate expectation
+    if [ "$matched" = "$expected" ]; then
+        echo "✓ PASS: '$message'"
+        echo "  → Matched: $matched"
+        return 0
+    else
+        echo "✗ FAIL: '$message'"
+        echo "  → Matched: $matched (expected: $expected)"
+        return 1
+    fi
+}
+
+# Run all test cases
+failed=0
+passed=0
+
+# MCP server commits (scope=mcp or unscoped)
+run_test "feat: add new feature" "mcp" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "feat(mcp): add API endpoint" "mcp" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "fix(mcp): resolve authentication bug" "mcp" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "docs: update README" "mcp" && passed=$((passed+1)) || failed=$((failed+1))
+
+# Helm chart commits
+run_test "feat(helm): add resource limits" "helm" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "fix(helm): correct values schema" "helm" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "docs(helm): update deployment guide" "helm" && passed=$((passed+1)) || failed=$((failed+1))
+
+# Astrolabe commits
+run_test "feat(astrolabe): add dark mode" "astrolabe" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "fix(astrolabe): resolve UI bug" "astrolabe" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "perf(astrolabe): optimize rendering" "astrolabe" && passed=$((passed+1)) || failed=$((failed+1))
+
+# Breaking changes
+run_test "feat(mcp)!: breaking API change" "mcp" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "feat(helm)!: rename values" "helm" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "feat(astrolabe)!: remove deprecated feature" "astrolabe" && passed=$((passed+1)) || failed=$((failed+1))
+
+# Invalid commits (should not match any)
+run_test "feat(invalid): test" "none" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "random commit message" "none" && passed=$((passed+1)) || failed=$((failed+1))
+run_test "feat (mcp): space before scope" "none" && passed=$((passed+1)) || failed=$((failed+1))
+
+# Summary
+echo
+echo "=========================================="
+echo "Results: $passed passed, $failed failed"
+echo "=========================================="
+
+if [ $failed -gt 0 ]; then
+    echo "❌ Some tests failed - scope patterns may need adjustment"
+    exit 1
+else
+    echo "✅ All tests passed - scope patterns working correctly"
+    exit 0
+fi