feat: rebrand OpenClaw references to Hermes during migration

- Add rebrand_text() that replaces OpenClaw, Open Claw, Open-Claw,
  ClawdBot, and MoltBot with Hermes (case-insensitive, word-boundary)
- Apply rebranding to memory entries (MEMORY.md, USER.md, daily memory)
- Apply rebranding to SOUL.md and workspace instructions via new
  transform parameter on copy_file()
- Fix moldbot -> moltbot typo across codebase (claw.py, migration
  script, docs, tests)
- Add unit tests for rebrand_text and integration tests for memory
  and soul migration rebranding

tests/hermes_cli/test_claw.py

@@ -58,13 +58,13 @@ class TestFindOpenclawDirs:
     def test_finds_legacy_dirs(self, tmp_path):
         clawdbot = tmp_path / ".clawdbot"
         clawdbot.mkdir()
-        moldbot = tmp_path / ".moldbot"
-        moldbot.mkdir()
+        moltbot = tmp_path / ".moltbot"
+        moltbot.mkdir()
         with patch("pathlib.Path.home", return_value=tmp_path):
             found = claw_mod._find_openclaw_dirs()
         assert len(found) == 2
         assert clawdbot in found
-        assert moldbot in found
+        assert moltbot in found
 
     def test_returns_empty_when_none_exist(self, tmp_path):
         with patch("pathlib.Path.home", return_value=tmp_path):