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/tht/session/artifacts.py

@@ -0,0 +1,39 @@
+from pathlib import Path
+
+from tht.decisions import DecisionRecord
+from tht.session.models import SchemaLinking
+
+
+def _find_evidence_file(evidence_root: Path, evidence_id: str) -> str:
+    for match in evidence_root.rglob(f"{evidence_id}.md"):
+        return str(match)
+    return ""
+
+
+def build_evidence_entries(
+    decisions: list[DecisionRecord],
+    linking: SchemaLinking,
+    evidence_root: Path,
+) -> list[dict]:
+    """Elenco {id, file, esito, decision_seq}: evidence citate nello schema linking
+    (esito 'usata') e decisioni esplicite del reviewer (accettata/scartata, che
+    prevalgono sul linking)."""
+    entries: dict[str, dict] = {}
+    for candidate in linking.candidates:
+        for evidence_id in candidate.evidence:
+            entries.setdefault(evidence_id, {
+                "id": evidence_id,
+                "file": _find_evidence_file(evidence_root, evidence_id),
+                "esito": "usata",
+                "decision_seq": candidate.decision_seq,
+            })
+    for d in decisions:
+        if d.type not in ("evidence_accepted", "evidence_rejected"):
+            continue
+        entries[d.subject] = {
+            "id": d.subject,
+            "file": _find_evidence_file(evidence_root, d.subject),
+            "esito": "accettata" if d.type == "evidence_accepted" else "scartata",
+            "decision_seq": d.seq,
+        }
+    return list(entries.values())