docs: record CI in ADR 0032 and mention it in README and agent rules

Also update docs-as-code to reflect that the docs check now runs in CI.

docs/adr/README.md

@@ -35,6 +35,7 @@ One ADR per feature or significant design decision. Format: `template.md`. Workf
 | 0029 | [Persistent Android release keystore kept out of git](0029-persistent-android-signing-keystore.md) | Distribution | Accepted |
 | 0030 | [Single-source versioning with a mandatory changelog entry](0030-single-source-versioning-and-changelog.md) | Distribution | Accepted |
 | 0031 | [Explicitly defer multisig, Lightning, Tor and hardware wallets](0031-defer-multisig-lightning-and-hardware-wallets.md) | Scope | Accepted |
+| 0032 | [Run tests, fuzz smoke and docs checks in GitHub Actions](0032-github-actions-ci.md) | Testing | Accepted |
 
 ADRs `0002` onwards were written retroactively on 2026-11-03 from the code, comments and changelog. 
 If one misstates the original reasoning, fix it in a pull request.