fix(ci): improve versioning and error handling

Addresses remaining high-priority code review feedback:

VERSIONING SCHEME FIXES:
- Helm chart: Changed from pep440 to semver (correct for Helm)
- Astrolabe: Changed from pep440 to semver (correct for Nextcloud apps)
- MCP server: Remains pep440 (correct for Python packages)

Helm charts must use semantic versioning per Helm specification.
Nextcloud apps use semantic versioning in info.xml and package.json.

ENHANCED ERROR HANDLING IN BUMP SCRIPTS:
All three bump scripts now include:
- Comprehensive validation checks
  * Tool availability (uv)
  * Directory structure (must run from repo root)
  * Required files exist (Chart.yaml, info.xml, package.json)
- Better error messages
  * Stderr output for errors
  * Captured commitizen output on failure
  * Common failure causes listed
- Success confirmation
  * Clear indication of what was updated
  * Next steps guidance (git push --follow-tags)
- Robust shell options (set -euo pipefail)

Scripts now provide helpful guidance when:
- No conventional commits found
- No commits with required scope
- Git working directory not clean
- Required dependencies missing

scripts/bump-mcp.sh

@@ -1,13 +1,39 @@
 #!/bin/bash
 # Bump MCP server version
-set -e
+set -euo pipefail
 
 # Validate dependencies
-command -v uv >/dev/null 2>&1 || { echo "Error: uv not found. Install from https://docs.astral.sh/uv/"; exit 1; }
+command -v uv >/dev/null 2>&1 || {
+    echo "❌ Error: uv not found" >&2
+    echo "   Install from https://docs.astral.sh/uv/" >&2
+    exit 1
+}
+
+# Validate we're in the repository root
+if [ ! -f "pyproject.toml" ]; then
+    echo "❌ Error: Must run from repository root (pyproject.toml not found)" >&2
+    exit 1
+fi
 
 echo "Bumping MCP server version..."
-uv run cz bump --yes
 
-echo "✓ MCP server version bumped"
-echo "  - Updated: pyproject.toml, Chart.yaml:appVersion"
-echo "  - Tag format: v\${version}"
+# Run commitizen bump and capture output
+if ! output=$(uv run cz bump --yes 2>&1); then
+    echo "❌ Error: Version bump failed" >&2
+    echo "$output" >&2
+    echo "" >&2
+    echo "Common causes:" >&2
+    echo "  - No commits since last version" >&2
+    echo "  - No conventional commits found (use feat:, fix:, etc.)" >&2
+    echo "  - Git working directory not clean" >&2
+    exit 1
+fi
+
+echo "$output"
+echo ""
+echo "✓ MCP server version bumped successfully"
+echo "  Updated: pyproject.toml, Chart.yaml:appVersion"
+echo "  Tag format: v\${version}"
+echo ""
+echo "Next steps:"
+echo "  git push --follow-tags"