chore(skills): English-only output + always commit/create-MR

Summary

Standardize all user-facing skill output on English and make the commit → push → MR flow run without stopping to ask.

Changes

• /commit — added explicit English rule (all output + commit message) and an auto-run rule: always commit, never ask for confirmation (only exception: asking for a Jira ticket when the branch has none).
• /create-mr — reply language Vietnamese → English; runs end-to-end automatically (no confirmation prompt). Pre-flight checks + self-merge warning gate still apply; still never auto-merges.
• /push — new STEP 9.5 auto-invokes /create-mr after a successful push (idempotent, never duplicates, never auto-merges); reply in English.
• /create-test, /daily-report — chat replies Vietnamese → English.
• /create-readme, /update-readme — README content Vietnamese → English.
• Bumped commit v3.1.0, create-mr v1.3.0; changelog 4.1.0.

Test plan

• Skim each edited skill and confirm no remaining Vietnamese reply directives
• Confirm /push STEP 9.5 references /create-mr and never auto-merges
• Confirm self-merge warning gate in /create-mr is preserved