🔧 chore: add deploy-testflight skill for TestFlight release tagging

Author: shp7724

SNUTT/.codex/skills/deploy-testflight/SKILL.md

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+---
+name: deploy-testflight
+description: "Create and push SNUTT iOS TestFlight deployment tags by asking for version, environment (dev/prod), and a one-word change slug, following README.md tag rules. Use when a user asks to deploy to TestFlight, tag a TestFlight release, or push TestFlight tags for SNUTT iOS."
+---
+
+# Deploy TestFlight tags (SNUTT iOS)
+
+## Workflow
+
+- Read `README.md` in the repo and follow the Deployment > Tag Format rules.
+- Ask the user for:
+  - Deployment version (e.g., `4.0.0`).
+  - Environment: `dev` or `prod`.
+  - One-word change slug (short, lowercase, letters/numbers/hyphens). This is required.
+- Build the tag:
+  - `dev` => `testflight/dev/v{version}-{slug}`
+  - `prod` => `testflight/v{version}-{slug}`
+- Verify the tag does not already exist: `git tag -l <tag>`.
+  - If it exists, stop and ask for a different version or slug. Do not delete tags unless explicitly asked.
+- Create the tag on current HEAD: `git tag <tag>`.
+- Push the tag: `git push origin <tag>`.
+- Report the created tag and the push result.
+
+## Notes
+
+- Do not create `appstore/` tags in this workflow.
+- If the user wants to re-deploy the same version, insist on a new slug.

SNUTT/.codex/skills/deploy-testflight/agents/openai.yaml

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+interface:
+  display_name: "Deploy TestFlight"
+  short_description: "Create/push SNUTT TestFlight tags"
+  default_prompt: "Use $deploy-testflight to tag and push a SNUTT iOS TestFlight release."