refactor(harness): renaming prodotto tht (Onda -1)

Thoth (tht) è il prodotto, PSD è il cliente. Nessun riferimento al contesto
clinico nel codice.

Rinomine:
- comando+package nsp→tht (dir nsp/→tht/, 46 import, pyproject entry point)
- gate nsp-gate.js→tht-gate.js (+ rewrite token, relayIfNspFails→relayIfThtFails)
- workspace chirone.{example,test}.yaml→tht.{example,test}.yaml (generici)
- env THOTH_→THT_ (19 var) + NSP_ stragglers (NSP_HARNESS_ROOT, NSP_SESSION)
- commenti/docstring chirone/psdwp3/policlinico neutralizzati ('the reference
  implementation', 'the DWH')

Aggiunto [tool.setuptools.packages.find] include=['tht*'] (necessario: l'auto-
discovery rompeva con tht/ + workspaces/ come top-level multipli).

.env operatore aggiornato in-place (prefissi THT_, valori preservati, gitignored).

Verifica: pytest 109 passed, npm test 14 pass, tht phase meta --json OK, zero
residui nsp/THOTH_/NSP_/chirone nel package.

harness/tests/l2/test_session_ablazione.py

@@ -11,8 +11,8 @@ MODES (both manual, non-deterministic, pre-release -- NOT a regression gate):
     Altro/value-grounding/rollback paths so specific behaviors assert deterministically.
 
 HOW TO RUN (operator, before release):
-  1. Populate harness/.env (THOTH_DWH_API_KEY, THOTH_VEC_API_KEY,
-     THOTH_VEC_WRITE_API_KEY, THOTH_SSL_CA, THOTH_*_REST_URL, THOTH_OLLAMA_URL).
+  1. Populate harness/.env (THT_DWH_API_KEY, THT_VEC_API_KEY,
+     THT_VEC_WRITE_API_KEY, THT_SSL_CA, THT_*_REST_URL, THT_OLLAMA_URL).
   2. Connect VPN. Ensure Pi is configured locally with GLM 5.2.
   3. Run: pytest -m l2 tests/l2/test_session_ablazione.py -s
 
@@ -30,13 +30,13 @@ import pytest
 
 pytestmark = [pytest.mark.l2]
 
-WORKSPACE = Path(__file__).resolve().parents[2] / "workspaces" / "chirone-test.yaml"
+WORKSPACE = Path(__file__).resolve().parents[2] / "workspaces" / "tht-test.yaml"
 QUESTION = "dammi la lista dei pazienti che hanno fatto un'ablazione nel 2025"
 
 
 def test_workspace_chirone_test_loads(l2_env):
-    """The L2 workspace YAML loads and expands ${THOTH_*} from .env."""
-    from nsp.workspace import load_workspace
+    """The L2 workspace YAML loads and expands ${THT_*} from .env."""
+    from tht.workspace import load_workspace
 
     ws = load_workspace(WORKSPACE)
     # secrets must be expanded (not the literal ${...} token)
@@ -68,7 +68,7 @@ def test_ablazione_session_manual(l2_env, tmp_path):
     # assertion. We surface the run instructions and assert only that the launch
     # context is ready; the operator drives the conversation and inspects the outcome.
     env_ok = all(os.environ.get(v, "").strip() for v in
-                 ["THOTH_DWH_API_KEY", "THOTH_VEC_API_KEY", "THOTH_VEC_WRITE_API_KEY"])
+                 ["THT_DWH_API_KEY", "THT_VEC_API_KEY", "THT_VEC_WRITE_API_KEY"])
     assert env_ok
     assert WORKSPACE.exists()
     print(f"\n[L2 manual] launch: pi --mode rpc (cwd=harness/)")