v3.19.0 — Holistic Review & Integration-Test Hygiene

Fifth review-driven milestone (phases 196–202); first non-feature after the
v3.14–v3.18 real-world feature run. Full 8-axis holistic review (0 Crit / 1 High
/ 11 Med / 13 Low) → High + value-cluster fix-set; deferred -tags integration
backlog drained; canonical make check-integration DoD gate stood up.

Headline fixes: generate --emit-joins no longer exits 0 on non-compiling codegen
(UX-01); VALUE_OBJECT_MISSING_SCAN_VALUE names the method; partial-geo-directive
GEO_AUTO_WRAP_SUPPRESSED INFO; internal planning tokens stripped from generated
exported doc-comments + panic strings; README/feature-matrix document v3.14–v3.18;
t.Skip-fakes-green test-hygiene fixes.

Regen-stable; ratchet 135/62/22/41/5 held; make lint 0; make vuln clean; 0 net-new deps.