fix: REPROCESS_PRODUCTS resolved company=None for unified_fiscal/RTC

REPROCESS_PRODUCTS is not in SYNC_JOB_KINDS, so it fell to the else branch of execute_job and hardcoded company=None
for _unified_fiscal - a real gap, not a missing feature: the same deterministic, fail-closed company_context.resolve()
every sync job already uses is cheap (no full-table scan, confirmed against the real database) and applies just as
well to a one-off reprocess job. Now resolves the real company the same way; falls back to None only when the
company genuinely cannot be resolved yet, never a silent guess. Does not touch RTC rule logic.

Verified end-to-end against the real production database (dry-run, zero writes) that this was the last domain still
carrying the old bug - field_contract's post-NCM fiscal completion already bypassed it entirely by reading
Installation.company_uf/crt/company_contribuinte_ipi directly (populated via the 1.3.7 heartbeat fix).

1123 tests passed (tests + central/tests + agent/tests), 0 failed. Version 1.3.8 (single GTI_FISCAL_VERSION).

tests/test_release_candidate.py

@@ -14,11 +14,11 @@ sys.path.insert(0, str(ROOT))
 def test_versions_are_coherent_across_hub_agent_and_packages():
     from central.app.version import GTI_FISCAL_VERSION
     v = (ROOT / "release" / "VERSION").read_text(encoding="utf-8").strip()
-    assert v == GTI_FISCAL_VERSION == "1.3.7"
+    assert v == GTI_FISCAL_VERSION == "1.3.8"
     pep = v.replace("-rc", "rc")
     for pp in ("central/pyproject.toml", "agent/pyproject.toml"):
         assert f'version = "{pep}"' in (ROOT / pp).read_text(encoding="utf-8")
-    assert '"AGENT_VERSION", "1.3.7"' in (ROOT / "agent" / "scripts" / "run_agent_service.py").read_text(encoding="utf-8")
+    assert '"AGENT_VERSION", "1.3.8"' in (ROOT / "agent" / "scripts" / "run_agent_service.py").read_text(encoding="utf-8")
     manifest = ROOT / "release" / "RELEASE_MANIFEST.json"
     if manifest.exists():
         m = json.loads(manifest.read_text(encoding="utf-8"))