fix(ci): replace empty catch blocks and raw stderr with logWarning

Fixes workflow-logger coverage test failures: empty catch blocks in
reopen-slice/reopen-task and raw process.stderr in reopen-milestone
now use logWarning from workflow-logger.

src/resources/extensions/gsd/tools/reopen-milestone.ts

@@ -23,6 +23,7 @@ import { isClosedStatus } from "../status-guards.js";
 import { renderAllProjections } from "../workflow-projections.js";
 import { writeManifest } from "../workflow-manifest.js";
 import { appendEvent } from "../workflow-events.js";
+import { logWarning } from "../workflow-logger.js";
 import { debugLog } from "../debug-logger.js";
 import { existsSync, unlinkSync } from "node:fs";
 import { join } from "node:path";
@@ -140,9 +141,7 @@ export async function handleReopenMilestone(
       trigger_reason: params.triggerReason,
     });
   } catch (hookErr) {
-    process.stderr.write(
-      `gsd: reopen-milestone post-mutation hook warning: ${(hookErr as Error).message}\n`,
-    );
+    logWarning("tool", `reopen-milestone post-mutation hook warning: ${(hookErr as Error).message}`);
   }
 
   return {

src/resources/extensions/gsd/tools/reopen-slice.ts

@@ -118,8 +118,8 @@ export async function handleReopenSlice(
       const sliceUat = join(sliceDir, `${params.sliceId}-UAT.md`);
       if (existsSync(sliceUat)) unlinkSync(sliceUat);
     }
-  } catch {
-    // Non-fatal
+  } catch (cleanupErr) {
+    logWarning("tool", `reopen-slice artifact cleanup warning: ${(cleanupErr as Error).message}`);
   }
   clearPathCache();
 

src/resources/extensions/gsd/tools/reopen-task.ts

@@ -112,8 +112,8 @@ export async function handleReopenTask(
       const summaryPath = join(tasksDir, `${params.taskId}-SUMMARY.md`);
       if (existsSync(summaryPath)) unlinkSync(summaryPath);
     }
-  } catch {
-    // Non-fatal — stale artifact may cause reconciler interference but won't crash
+  } catch (cleanupErr) {
+    logWarning("tool", `reopen-task artifact cleanup warning: ${(cleanupErr as Error).message}`);
   }
   clearPathCache();