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_value_grounding_real.py

@@ -10,31 +10,31 @@ from pathlib import Path
 
 import pytest
 
-from nsp.workspace import load_workspace
+from tht.workspace import load_workspace
 
 pytestmark = [pytest.mark.l2]
-WORKSPACE = Path(__file__).resolve().parents[2] / "workspaces" / "chirone-test.yaml"
+WORKSPACE = Path(__file__).resolve().parents[2] / "workspaces" / "tht-test.yaml"
 
 
 def test_ablazione_returns_multiple_columns(l2_env):
     """On the real schema, 'ablazione' should ground to more than one column (e.g.
     a flag and a free-text patologia field) -- the whole point of D14a's
-    non-collapsing aggregation. Requires a built LSH index (nsp lsh build)."""
-    from nsp.config import LshConfig
+    non-collapsing aggregation. Requires a built LSH index (tht lsh build)."""
+    from tht.config import LshConfig
     try:
-        from nsp.lshindex import load_index, query_index  # ported with the lsh build path
+        from tht.lshindex import load_index, query_index  # ported with the lsh build path
     except ModuleNotFoundError:
-        pytest.skip("nsp.lshindex not yet ported (deferred from B3; lands with nsp lsh build)")
-    from nsp.search import aggregate_lsh_multi
+        pytest.skip("tht.lshindex not yet ported (deferred from B3; lands with tht lsh build)")
+    from tht.search import aggregate_lsh_multi
 
-    # NOTE: this test assumes the LSH index was built (nsp lsh build --workspace
-    # chirone-test). If absent, build it first. The index path comes from the config.
+    # NOTE: this test assumes the LSH index was built (tht lsh build --workspace
+    # tht-test). If absent, build it first. The index path comes from the config.
     ws = load_workspace(WORKSPACE)
     index_dir = ws.paths.indexes
     try:
         lsh, minhashes, meta = load_index(index_dir, "datawarehouse")
     except Exception as e:
-        pytest.skip(f"LSH index not built yet (run nsp lsh build): {e}")
+        pytest.skip(f"LSH index not built yet (run tht lsh build): {e}")
 
     hits = query_index(lsh, minhashes, "ablazione", meta, top_n=20)
     grouped = aggregate_lsh_multi(