diff --git a/mempalace/project_scanner.py b/mempalace/project_scanner.py
index bbdb6f4..741a3e2 100644
--- a/mempalace/project_scanner.py
+++ b/mempalace/project_scanner.py
@@ -627,13 +627,18 @@ def discover_entities(
     root_path = Path(project_dir).expanduser().resolve()
     if is_claude_projects_root(root_path):
         convo_projects = scan_claude_projects(root_path)
-        # Dedup by name against the git-manifest list, preferring entries with
-        # more user_commits as signal strength.
-        by_name: dict[str, ProjectInfo] = {p.name: p for p in projects}
+        # Dedup by name against the git-manifest list, preferring entries
+        # with more user_commits as signal strength. Keyed case-insensitively
+        # so a `pyproject.toml` name like `mempalace` and a Claude Code
+        # `cwd` variant like `MemPalace` collapse into one entry — matches
+        # the case-insensitive dedup used in `_merge_detected` and
+        # `miner.add_to_known_entities`.
+        by_name: dict[str, ProjectInfo] = {p.name.lower(): p for p in projects}
         for cp in convo_projects:
-            existing = by_name.get(cp.name)
+            key = cp.name.lower()
+            existing = by_name.get(key)
             if existing is None or cp.user_commits > existing.user_commits:
-                by_name[cp.name] = cp
+                by_name[key] = cp
         projects = sorted(
             by_name.values(),
             key=lambda p: (not p.is_mine, -p.user_commits, -p.total_commits, p.name),
diff --git a/tests/test_project_scanner.py b/tests/test_project_scanner.py
index 2dc939a..49126b4 100644
--- a/tests/test_project_scanner.py
+++ b/tests/test_project_scanner.py
@@ -524,6 +524,34 @@ def test_discover_entities_keeps_llm_only_project_uncertain_when_real_signal(tmp
     assert "Terraform" in [e["name"] for e in d["uncertain"]]
 
 
+def test_discover_entities_collapses_case_variants_between_manifest_and_convo(tmp_path):
+    """A project named `myproj` in a manifest and `MyProj` as a Claude Code
+    cwd must collapse into one entry. Matches the case-insensitive dedup
+    used by `_merge_detected` and `miner.add_to_known_entities`."""
+    root = tmp_path / "projects_root"
+    root.mkdir()
+
+    # Entry 1: a git+manifest project named lowercase `myproj`
+    repo = root / "-home-u-src-myproj"
+    repo.mkdir()
+    (repo / "package.json").write_text(json.dumps({"name": "myproj"}))
+    _init_git_repo(repo)
+
+    # Entry 2: same root ALSO looks like a Claude Code `.claude/projects/` dir;
+    # the convo_scanner inside will resolve `cwd` to `/home/u/src/MyProj`
+    # (CamelCase variant of the same project).
+    session = repo / "abc.jsonl"
+    session.write_text(json.dumps({"type": "user", "cwd": "/home/u/src/MyProj"}) + "\n")
+
+    d = discover_entities(str(root))
+
+    project_names = [e["name"] for e in d["projects"]]
+    # One entry, not two. First-seen casing ("myproj" from the manifest scan)
+    # is the winner since it was seeded first.
+    assert len(project_names) == 1
+    assert project_names[0].lower() == "myproj"
+
+
 # ── _UnionFind basics ──────────────────────────────────────────────────