feat(release): add generation workflow

Add a guarded mobile release skill that synchronizes public versions, writes on-brand notes, verifies signed iOS and Android artifacts, and tags the verified release commit.

.codex/skills/generate-release/references/artifact-verification.md

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+# Release artifact verification
+
+Use the strongest locally available platform tools and record the commands and
+results. Never print provisioning profiles, keys, tokens, or environment values.
+
+## Android AAB
+
+Require a production `.aab`. Inspect its manifest with `bundletool dump manifest`
+or Android SDK `apkanalyzer`, and verify:
+
+- package `com.sauci.app`;
+- `versionName` equals the release version;
+- `versionCode` equals the recorded Android build number.
+
+Verify the archive signature with `jarsigner -verify -verbose -certs`. Compare the
+signing certificate SHA-1 to the production fingerprint documented in
+`docs/releasing.md`; do not copy credentials into commands or reports. Calculate
+the artifact SHA-256 with `shasum -a 256`.
+
+## iOS IPA
+
+Extract the `.ipa` into a new temporary directory created with `mktemp -d`. Read
+the application `Info.plist` with `/usr/libexec/PlistBuddy` or `plutil` and verify:
+
+- `CFBundleIdentifier` is `com.sauci.app`;
+- `CFBundleShortVersionString` equals the release version;
+- `CFBundleVersion` equals the recorded iOS build number.
+
+Use `codesign -dvvv` and `codesign --verify --deep --strict` on the extracted app
+to inspect and verify signing without exposing the embedded profile. Calculate the
+original `.ipa` SHA-256 with `shasum -a 256`. Remove only the explicit temporary
+extraction directory after inspection.
+
+## Source correspondence
+
+For both platforms, retain the build command, artifact path, build completion
+time, and digest in the final report. Compare the post-build tracked diff with the
+documented allowed version files. A binary with the right version but unexpected
+source regeneration, wrong signing, or an unverifiable manifest is not accepted.