Add the SQA and QC framework and project instructions

Mount the framework as a submodule at framework/ (v0.4.0), add AGENTS.md and
the installed skill copies for Codex CLI (.agents/skills) and Claude Code
(.claude/skills).

.agents/skills/artifact/references/GOV.md

@@ -0,0 +1,16 @@
+# Governance / ARB Workflow (GOV)
+
+One per project: `docs/sqa/governance.md`. Sections: Purpose, ARB Review
+Workflow (submission → QC review → `RC-*` record → Go/No-Go → sign-off →
+Traceability update), RACI by Artifact Category, Escalation Rules, Cadence.
+The template has the standard text; fill the RACI.
+
+**RACI cells use exact stakeholder IDs from the project's Stakeholder
+Analysis (`S<NN>`), never role names.**
+
+Related singletons (edit the existing file, no scaffold needed):
+- `PRC` — `framework/process/review-checklist-process.md`, the narrative
+  review procedure. Framework-level; do not add project data.
+- `CSG` — `docs/sqa/coding-standards-governance.md`. Scope is *defining and
+  governing* (not enforcing) language standards and style guides, as set by
+  the project Business Case's scope.