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/cli/phase_cmd.py

@@ -0,0 +1,51 @@
+"""tht phase -- workflow HITL gate commands.
+
+`meta` is the single source the gate (tht-gate.js) reads workflow facts from,
+killing the JS/Python PHASE_NAMES drift (F2). advance/reopen/show land with the
+session/db ports (A9) -- they need current_phase + load_session_or_exit which
+depend on the not-yet-ported session store helpers.
+"""
+from __future__ import annotations
+
+import json
+
+import typer
+
+from tht.workflow import load_workflow
+
+phase_app = typer.Typer(help="Fase del workflow HITL (gate di avanzamento/ritorno)")
+
+
+@phase_app.command("meta")
+def meta_cmd(
+    as_json: bool = typer.Option(
+        False,
+        "--json",
+        help="Emette i metadati del workflow come JSON (usato dall'estensione gate).",
+    ),
+) -> None:
+    """Stampa i metadati del workflow derivati da workflow.yaml (F2)."""
+    wf = load_workflow()
+    if not as_json:
+        typer.echo(f"max_phase: {wf.max_phase}")
+        for p in wf.phases:
+            typer.echo(f"  {p.id} ({p.num}/{wf.max_phase}) {p.name}  advance={p.advance}")
+        return
+    typer.echo(
+        json.dumps(
+            {
+                "schema_version": wf.schema_version,
+                "max_phase": wf.max_phase,
+                "phases": [
+                    {
+                        "num": p.num,
+                        "id": p.id,
+                        "name": p.name,
+                        "advance": p.advance,
+                        "artifacts_out": p.artifacts_out,
+                    }
+                    for p in wf.phases
+                ],
+            }
+        )
+    )