feat: run delete-branch-on-merge setup on copier update too

[ichoosetoaccept]

The gh repo edit task that enables delete-branch-on-merge and
auto-merge was copy-only. Projects created before this task was
added never got the setting. Now runs on every copier operation
since it's idempotent and fails silently.

Resolves DOT-480

Closes #

[ichoosetoaccept]

This change is part of the following stack:

• fix: warn if build_command is missing git add uv.lock after template update #304
  • feat: run delete-branch-on-merge setup on copier update too #305 ◀

_{Change managed by git-spice.}

[linear]

DOT-480 feat: enable delete_branch_on_merge in copier post-create task

[greptile-apps]

Greptile Summary

Removes the when: "{{ _copier_operation == 'copy' }}" guard from the gh repo edit task so that delete-branch-on-merge and auto-merge are enabled on every copier operation (copy, update, recopy), not just the initial copy. The command is already safe to run unconditionally — the &&-chained guards (command -v gh, gh repo view) and the trailing || true ensure silent no-ops when gh is absent, no GitHub context exists, or the edit fails.

Confidence Score: 5/5

Safe to merge — single-line guard removal with well-established idempotency via existing CLI guards and || true.

The change is minimal and correct. All remaining findings are P2 or lower (the misleading comment was already flagged in a prior review thread). The command's failure-safe design handles every edge case (no gh, no git, no permissions) cleanly.

No files require special attention.

Important Files Changed

Filename	Overview
copier.yml	Removes when: copy guard from gh repo edit task so it runs idempotently on all copier operations; command already has safe guards via &&/`

Sequence Diagram

sequenceDiagram
    participant U as User
    participant C as Copier
    participant GH as gh CLI

    U->>C: copier copy / update / recopy
    C->>C: chmod scripts
    C->>C: uv sync --upgrade
    alt update or recopy
        C->>C: prek install (if .git exists)
    end
    C->>GH: command -v gh (check if installed)
    alt gh not found
        GH-->>C: fail → || true (silent skip)
    else gh found
        C->>GH: gh repo view (check GitHub repo context)
        alt not a GitHub repo
            GH-->>C: fail → || true (silent skip)
        else GitHub repo found
            C->>GH: gh repo edit --delete-branch-on-merge --enable-auto-merge
            GH-->>C: success / fail → || true (silent skip)
        end
    end
    alt copy
        C->>U: printf "🎉 Project created!"
    else update or recopy
        C->>U: printf "🎉 Template updated!"
    end

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