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).

.claude/skills/artifact/references/RC.md

@@ -0,0 +1,45 @@
+# SQA Review Record (RC)
+
+One record per review of a specific artifact instance against its QC
+checklist. Create one for **every** artifact instance in the project.
+
+- **File:** `docs/sqa/reviews/rc-<NNN>-<instance-slug>.md`
+- **ID:** `RC-NNN`, sequential across all artifact types (the registry's
+  Next Available Version for `RC`).
+- **Create:** `new-artifact.sh RC --file docs/sqa/reviews/rc-NNN-<slug>.md
+  --cite <INSTANCE-ID>=<instance path> --cite QC-<SHORT>-001=framework/qc/<checklist>.md`
+
+## Required sections (after Metadata / Version History)
+
+- **Artifact Under Review** — links to the instance and to the QC checklist
+  used, the scope (`full review`, or `delta re-review` with the criteria
+  covered, the reason and the earlier record), the artifact's language and
+  domain (its `Language` and `Domain` rows, `n/a` for a technical type) and
+  the language reviewer (a stakeholder ID, or `none`).
+- **Checklist Results** — `# | Criterion | Status (Pass/Fail/N-A) |
+  Evidence/Notes`, one row per criterion copied from the QC checklist, in
+  the same order.
+- **Language and Domain Results** — only for an artifact of a type written in
+  the PO language: the rows of `QC-LANG-001`, same columns and order. `N-A` is
+  not allowed for criteria 3, 5 and 9.
+- **Overall Verdict** — Go / Go-with-conditions / No-Go, with rationale.
+- **Action Items** — `Action | Owner | Due`. `Owner` is a stakeholder ID from
+  the project's Stakeholder Analysis, never a role name. Every `Fail` and
+  every condition gets an item.
+
+## After the review
+
+- The reviewer must not be the artifact's author (see governance). For a
+  PO-language artifact the reviewer must read its language and know its
+  domain, or a second reviewer, the language reviewer, does and is named on
+  the record; see `process/review-checklist-process.md`.
+- The record is in English. Quote evidence that is the artifact's own wording
+  in its language, with a short gloss.
+- Add or update the instance's row in the Traceability Matrix, including
+  this `RC-*` in "Last Reviewed".
+- On **Go**, set the reviewed artifact's latest `## Version History` row to
+  `Accepted` and the row before it to `Deprecated` (`Approved` is not a
+  status). On Go-with-conditions the status stays `Proposed` until the action
+  items are closed. If the change is refused for good, set the row to
+  `Rejected` (the earlier `Accepted` row stays).
+- Step-by-step narrative: `framework/process/review-checklist-process.md`.