v0.2.2: BUILD_FAILED pull failure aborts redeploy with clear message

Remove contextlib.suppress from the image pull step in the BUILD_FAILED
redeploy path. A failed pull (e.g. non-existent tag) now immediately
returns an actionable error pointing to update_image_tag instead of
silently continuing and starting the project with stale/missing image.

Also bumps version 0.2.1 → 0.2.2 and adds CHANGELOG entry.

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

src/mcp_synology_container/modules/projects.py

@@ -167,8 +167,15 @@ def register_projects(mcp: FastMCP, config: AppConfig, client: DsmClient) -> Non
                     await client.request("SYNO.Docker.Project", "stop", params={"id": project_id})
                 results.append("  Build stopped.")
                 results.append("Step 2/4: Pulling updated images...")
-                with contextlib.suppress(Exception):
+                try:
                     await client.request("SYNO.Docker.Image", "pull", params={"id": project_id})
+                except Exception as pull_err:
+                    results.append(f"  Pull failed: {pull_err}")
+                    results.append(
+                        "Aborted: image pull failed — the image tag in compose.yaml may not exist. "
+                        "Fix the tag with update_image_tag, then retry redeploy_project."
+                    )
+                    return "\n".join(results)
                 results.append("  Images pulled.")
                 results.append("Step 3/4: Starting project...")
                 await client.request("SYNO.Docker.Project", "start", params={"id": project_id})