[anikettt2499]

Summary

• Step 1 (CircleCI): No change needed — opengamma-orb is not referenced in .circleci/config.yml.
• Step 2 (GitHub workflows): Created all 5 standard workflows (none existed before): pr-fix.yml, pr-review.yml, pr-review-stats.yml, tt-margin-pr-automation.yml, tt-margin-pr-automation-target.yml.
• Step 3 (Dependabot): No change needed — no Artifactory registry entry in .github/dependabot.yml.
• Step 4 (CODEOWNERS): No change needed — only entry is @jodastephen (a username, not an OpenGamma team slug).
• Step 5 (Mergify): Deleted .github/mergify.yml.

Repo admin steps (in order)

1. Remove Mergify Merge Protections from the required status checks on main.
2. Merge this PR.
3. Add jira / Ensure JIRA reference as a required status check on main.

Automation workflow requirements

The two tt-margin-pr-automation workflows require:

• The tt-margin-bot GitHub App is installed on the repository (Contents and Pull requests write permissions).
• tt-margin-bot is added to "Restrict who can push" on main if that restriction is enabled.
• Allow auto-merge is turned on in repository settings.

What Mergify did that is not replaced

• Merge queue ordering and urgent/dependency priorities.
• Converting WIP titles to draft (a non-draft WIP PR with the auto-merge label will now auto-merge once approved).
• Stale PR comments.
• Size labels.

Jira: CORE-2517

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