diff --git a/src/memory-quality.ts b/src/memory-quality.ts
index bf046b8..c473b8b 100644
--- a/src/memory-quality.ts
+++ b/src/memory-quality.ts
@@ -9,6 +9,21 @@ export type MemoryQualityResult = {
   reasons: string[];
 };
 
+export const HARD_QUALITY_REASONS: ReadonlySet<string> = new Set([
+  "empty",
+  "progress_snapshot",
+  "raw_error",
+  "commit_or_ci_snapshot",
+  "temporary_status",
+  "active_file_snapshot",
+  "code_or_api_signature",
+  "path_heavy",
+]);
+
+export function isHardQualityReason(reason: string): boolean {
+  return HARD_QUALITY_REASONS.has(reason);
+}
+
 export function assessMemoryQuality(entry: MemoryQualityInput): MemoryQualityResult {
   const reasons: string[] = [];
   const text = entry.text.trim();
diff --git a/src/workspace-memory.ts b/src/workspace-memory.ts
index af64f0d..3000d7f 100644
--- a/src/workspace-memory.ts
+++ b/src/workspace-memory.ts
@@ -2,7 +2,7 @@ import type { LongTermMemoryEntry, WorkspaceMemoryStore } from "./types.ts";
 import { LONG_TERM_LIMITS } from "./types.ts";
 import { workspaceKey, workspaceMemoryPath } from "./paths.ts";
 import { atomicWriteJSON, readJSON, updateJSON } from "./storage.ts";
-import { assessMemoryQuality, isProgressSnapshotViolation } from "./memory-quality.ts";
+import { assessMemoryQuality, isHardQualityReason, isProgressSnapshotViolation } from "./memory-quality.ts";
 
 // Minimum length for workspace_memory envelope: <workspace_memory>\n...\n</workspace_memory>
 const MIN_ENVELOPE_LENGTH = 80;
@@ -188,9 +188,11 @@ export async function normalizeWorkspaceMemoryWithAccounting(
     };
   });
 
-  // One-time migration for legacy snapshot violations
-  result = runMigrationP0Cleanup(result, nowIso);
+  // One-time migrations for legacy/low-quality snapshot violations.
+  // Run quality cleanup first so hard violations receive quality audit tags
+  // before the older P0 project-only cleanup marks progress snapshots.
   result = runMigrationQualityCleanup(result, nowIso);
+  result = runMigrationP0Cleanup(result, nowIso);
 
   // P0 accounting only considers active entries. Entries that were already
   // superseded before this normalization are preserved in storage; entries that
@@ -285,7 +287,7 @@ export function runMigrationP0Cleanup(
   };
 }
 
-function runMigrationQualityCleanup(
+export function runMigrationQualityCleanup(
   store: WorkspaceMemoryStore,
   nowIso: string,
 ): WorkspaceMemoryStore {
@@ -301,11 +303,14 @@ function runMigrationQualityCleanup(
     const quality = assessMemoryQuality(entry);
     if (quality.accepted) return entry;
 
+    const hardReasons = quality.reasons.filter(isHardQualityReason);
+    if (hardReasons.length === 0) return entry;
+
     changed = true;
     const tags = new Set([
       ...(entry.tags ?? []),
       "quality_cleanup",
-      ...quality.reasons.map(reason => `quality:${reason}`),
+      ...hardReasons.map(reason => `quality:${reason}`),
     ]);
 
     return {
diff --git a/tests/memory-quality-eval.test.ts b/tests/memory-quality-eval.test.ts
index cb8e3e8..c51c0a7 100644
--- a/tests/memory-quality-eval.test.ts
+++ b/tests/memory-quality-eval.test.ts
@@ -1,7 +1,7 @@
 import test from "node:test";
 import assert from "node:assert/strict";
 import { extractExplicitMemories, parseWorkspaceMemoryCandidates } from "../src/extractors.ts";
-import { assessMemoryQuality } from "../src/memory-quality.ts";
+import { assessMemoryQuality, isHardQualityReason } from "../src/memory-quality.ts";
 import { expectedAcceptedFixtureIds, reviewerCurrent28Fixture } from "./fixtures/memory-quality-current-28.ts";
 
 const acceptedCases = [
@@ -159,3 +159,17 @@ test("explicit memories bypass extraction quality gate", () => {
   assert.equal(entries[0].source, "explicit");
   assert.match(entries[0].text, /Wave 1 completed/);
 });
+
+test("hard quality reasons exclude soft whitelist failures", () => {
+  assert.equal(isHardQualityReason("progress_snapshot"), true);
+  assert.equal(isHardQualityReason("raw_error"), true);
+  assert.equal(isHardQualityReason("commit_or_ci_snapshot"), true);
+  assert.equal(isHardQualityReason("temporary_status"), true);
+  assert.equal(isHardQualityReason("active_file_snapshot"), true);
+  assert.equal(isHardQualityReason("code_or_api_signature"), true);
+  assert.equal(isHardQualityReason("path_heavy"), true);
+  assert.equal(isHardQualityReason("empty"), true);
+
+  assert.equal(isHardQualityReason("bad_feedback"), false);
+  assert.equal(isHardQualityReason("bad_decision"), false);
+});
diff --git a/tests/workspace-memory.test.ts b/tests/workspace-memory.test.ts
index 6898e29..04ac928 100644
--- a/tests/workspace-memory.test.ts
+++ b/tests/workspace-memory.test.ts
@@ -20,8 +20,8 @@ import {
   saveWorkspaceMemory,
   updateWorkspaceMemoryWithAccounting,
 } from "../src/workspace-memory.ts";
-import { isProgressSnapshotViolation } from "../src/memory-quality.ts";
-import { reviewerCurrent28Fixture, expectedAcceptedFixtureIds } from "./fixtures/memory-quality-current-28.ts";
+import { assessMemoryQuality, isHardQualityReason, isProgressSnapshotViolation } from "../src/memory-quality.ts";
+import { reviewerCurrent28Fixture } from "./fixtures/memory-quality-current-28.ts";
 
 function entry(id: string, text: string, type: LongTermMemoryEntry["type"] = "decision"): LongTermMemoryEntry {
   const now = new Date().toISOString();
@@ -954,7 +954,84 @@ test("runMigrationP0Cleanup marks only non-explicit project snapshots and runs o
   assert.equal(twice.entries.find(e => e.id === "project-snapshot")?.updatedAt, once.entries.find(e => e.id === "project-snapshot")?.updatedAt);
 });
 
-test("quality cleanup migration supersedes low-quality compaction memories from current-28 fixture", async () => {
+test("quality cleanup migration preserves soft-only feedback and decision violations", async () => {
+  const root = await mkdtemp(join(tmpdir(), "wm-quality-soft-preserve-"));
+  try {
+    const now = new Date().toISOString();
+    await saveWorkspaceMemory(root, {
+      version: 1,
+      workspace: { root, key: await workspaceKey(root) },
+      limits: { maxRenderedChars: LONG_TERM_LIMITS.maxRenderedChars, maxEntries: LONG_TERM_LIMITS.maxEntries },
+      entries: [
+        {
+          id: "soft_feedback",
+          type: "feedback",
+          text: "UI 要統一風格：兩個表格都要 scrollable，約 20 rows",
+          source: "compaction",
+          confidence: 0.75,
+          status: "active",
+          createdAt: now,
+          updatedAt: now,
+        },
+        {
+          id: "soft_decision",
+          type: "decision",
+          text: "Product branding is \"OpenCode Working Memory\" without \"Plugin\" in the name",
+          source: "compaction",
+          confidence: 0.75,
+          status: "active",
+          createdAt: now,
+          updatedAt: now,
+          staleAfterDays: 45,
+        },
+      ],
+      migrations: [],
+      updatedAt: now,
+    });
+
+    const loaded = await loadWorkspaceMemory(root);
+    assert.equal(loaded.entries.find(e => e.id === "soft_feedback")?.status, "active");
+    assert.equal(loaded.entries.find(e => e.id === "soft_decision")?.status, "active");
+    assert.ok(loaded.migrations?.includes("2026-04-28-quality-cleanup"));
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test("quality cleanup migration supersedes hard quality violations", async () => {
+  const root = await mkdtemp(join(tmpdir(), "wm-quality-hard-supersede-"));
+  try {
+    const now = new Date().toISOString();
+    await saveWorkspaceMemory(root, {
+      version: 1,
+      workspace: { root, key: await workspaceKey(root) },
+      limits: { maxRenderedChars: LONG_TERM_LIMITS.maxRenderedChars, maxEntries: LONG_TERM_LIMITS.maxEntries },
+      entries: [{
+        id: "hard_progress",
+        type: "project",
+        text: "測試套件：1237 tests pass, 226 suites",
+        source: "compaction",
+        confidence: 0.75,
+        status: "active",
+        createdAt: now,
+        updatedAt: now,
+        staleAfterDays: 60,
+      }],
+      migrations: [],
+      updatedAt: now,
+    });
+
+    const loaded = await loadWorkspaceMemory(root);
+    const entry = loaded.entries.find(e => e.id === "hard_progress");
+    assert.equal(entry?.status, "superseded");
+    assert.ok(entry?.tags?.includes("quality_cleanup"));
+    assert.ok(entry?.tags?.includes("quality:progress_snapshot"));
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test("quality cleanup migration supersedes only hard violations from current fixture", async () => {
   const root = await mkdtemp(join(tmpdir(), "wm-quality-cleanup-"));
   try {
     const now = new Date().toISOString();
@@ -972,10 +1049,12 @@ test("quality cleanup migration supersedes low-quality compaction memories from
     const supersededIds = new Set(loaded.entries.filter(entry => entry.status === "superseded").map(entry => entry.id));
 
     for (const entry of reviewerCurrent28Fixture) {
-      if (expectedAcceptedFixtureIds.has(entry.id)) {
-        assert.equal(activeIds.has(entry.id), true, `${entry.id} should remain active`);
-      } else {
+      const quality = assessMemoryQuality(entry);
+      const hasHardReason = quality.reasons.some(isHardQualityReason);
+      if (entry.source === "compaction" && !quality.accepted && hasHardReason) {
         assert.equal(supersededIds.has(entry.id), true, `${entry.id} should be superseded`);
+      } else {
+        assert.equal(activeIds.has(entry.id), true, `${entry.id} should remain active`);
       }
     }