feat: harden runtime readiness and session workflow

harness/tests/test_portable_paths.py

@@ -2,7 +2,7 @@ from pathlib import Path
 
 import pytest
 
-from tht.config import ConfigError, load_config
+from tht.config import ConfigError, load_config, workspace_id_from_path
 from tht.paths import resolve_workspace_paths
 
 
@@ -108,3 +108,15 @@ def test_no_data_root_preserves_legacy_relative_paths(monkeypatch, tmp_path):
 
     assert cfg.paths.sessions == Path("sessions")
     assert cfg.paths.artifacts == Path("artifacts")
+
+
+def test_workspace_identity_resolves_config_symlink(tmp_path):
+    (tmp_path / "workspaces").mkdir()
+    workspace = _write_config(tmp_path / "workspaces/local.yaml")
+    alias = tmp_path / "config/tht.yaml"
+    alias.parent.mkdir()
+    alias.symlink_to(workspace)
+
+    assert workspace_id_from_path(alias) == "local"
+    assert load_config(alias)._workspace_id == "local"
+    assert load_config(alias)._config_source == workspace.resolve().as_posix()