feat(harness): port config_cmd + schema_cmd + session_cmd (Onda 1.3-1.4, radici CLI)

Le 3 radici intra-CLI, portate con rename psdwp3->tht + fix path import (session.phase
-> phase). Espongono gli helper condivisi: CONFIG_OPT (config_cmd), _load_config_or_exit/
physical_path/annotations_path (schema_cmd), session_dir/load_session_or_exit (session_cmd).

Drift phase fix in session_cmd (7 siti): MAX_PHASE -> wf.max_phase, PHASE_NAMES ->
wf.phase_name(), SCHEMA_LINKING_PHASE -> wf.schema_linking_phase(). Le vecchie costanti
non esistono piu' in tht.phase (sono metodi su Workflow dalla Onda -1/F2).

Check grep-per-file applicato: trovati e fixati 4 residui (config/nsp.yaml, 2x
'nsp schema introspect', 'Sessioni PsdWp3') che il sed psdwp3->tht non tocca. Lesson
del fix precedente applicata.

session_cmd importa sql_cmd lazy (dentro finalize_cmd) -> non si rompe finche' sql_cmd
(Onda 4) non sara' portato.

Suite: 161 passed. tht --help ora mostra phase, config, schema, session.

harness/tht/cli/__init__.py

@@ -36,6 +36,12 @@ def main(
     pass
 
 
+from tht.cli.config_cmd import config_app  # noqa: E402
 from tht.cli.phase_cmd import phase_app  # noqa: E402
+from tht.cli.schema_cmd import schema_app  # noqa: E402
+from tht.cli.session_cmd import session_app  # noqa: E402
 
 app.add_typer(phase_app, name="phase")
+app.add_typer(config_app, name="config")
+app.add_typer(schema_app, name="schema")
+app.add_typer(session_app, name="session")