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/docs/workflow-editing.md

@@ -1,8 +1,8 @@
 # Editing the workflow
 
 `harness/workflow.yaml` is the **single source of workflow truth** (spec F2, §5.3).
-`phase.py`, the gate (`nsp-gate.js`), and the skill all read from it. There are **no
-mirrored constants** in JS or Python — that was the ChironeWp3 drift bug
+`phase.py`, the gate (`tht-gate.js`), and the skill all read from it. There are **no
+mirrored constants** in JS or Python — that was the the reference implementation drift bug
 (`PHASE_NAMES` truncated to 7 entries in JS, F8/datamart silently dropped). Editing
 this one file is the only place the workflow changes.
 
@@ -12,7 +12,7 @@ this one file is the only place the workflow changes.
 schema_version: 1
 phases:
   - id: F3                      # stable id (referenced by the gate)
-    name: riscrittura           # human label (nsp phase show / gate UI)
+    name: riscrittura           # human label (tht phase show / gate UI)
     advance: kind:phase         # how the phase advances (see below)
     prerequisites:              # what must hold before advancing (gate checks these)
       - decision_exists: question_rewritten
@@ -68,7 +68,7 @@ preserved. This is the D15 fix for the orphaned-CTE-blocks-finalize bug.
 ## After editing
 
 ```bash
-nsp phase meta --json     # confirm the new shape (max_phase, phases, artifacts_out)
+tht phase meta --json     # confirm the new shape (max_phase, phases, artifacts_out)
 pytest                    # L1 coherence smoke re-derives from the new workflow.yaml
 ```