fix(changeset): retarget compare-gate changeset at @anarchitecture/ghost

[gnahCnayR]

What

Retargets .changeset/add-compare-gate-mode.md from ghost-drift (the pre-unification workspace package name) to @anarchitecture/ghost (the unified package on main).

Why

The Release workflow that fired on the #78 merge commit failed in the Create Release PR or publish step:

🦋  error Error: Found changeset add-compare-gate-mode for package ghost-drift which is not in the workspace

Failing run: https://github.com/block/ghost/actions/runs/26118777942/job/76814916209

The changeset for PR #78 was written against the pre-unification package name ghost-drift. When I rebased #78 onto main after the unified-package refactor landed, I updated the code (@ghost/core → #ghost-core, file paths under packages/ghost/, regenerated the cli-manifest) but missed updating the changeset frontmatter. The error only surfaces post-merge because the Release workflow only runs on main.

Fix

• Update the changeset's package key from ghost-drift to @anarchitecture/ghost
• Update the prose body from ghost-drift compare to ghost compare to match the unified CLI surface

Verification

$ pnpm changeset status
🦋  info Packages to be bumped at minor:
🦋  - @anarchitecture/ghost
``"

Once this lands, the Release workflow should produce a normal Version Packages PR for `@anarchitecture/ghost` at minor (which is the intended `--gate`-mode-shipped version bump).