Task: Promote Square auth client candidate to main

Identity

Fast-forward local main from 1907924 to verified candidate e7ec12d.
Keep the accepted Square authentication boundary and code changes while replacing the candidate integration task record with this promotion task record.
Verify the final default-branch tree and project-document ownership gates.

Preserve .project-docs/30-worklog/tasks/20260819-package-learning-off-115-9c4d.md exactly as authorized; it is not part of this promotion.
Do not merge unrelated branches or push to a remote.
Keep Renderer credential-free, Main as session owner, and all login/refresh/logout traffic behind Works Square.

Fast-forwarded local main from 1907924 to verified Square-auth candidate e7ec12d without conflicts.
Replaced the candidate integration task record with this promotion record and updated canonical current state to identify the local main promotion.
Preserved .project-docs/30-worklog/tasks/20260819-package-learning-off-115-9c4d.md as an unrelated untracked file and did not stage, edit, or delete it.

Final main: focused Works-session/auth-route suite passed 56/56 using the candidate worktree's lock-equivalent Vitest 4.1.1 binary.
Final main: TypeScript --noEmit passed using the same verified candidate toolchain.
Candidate full suite passed 184 test files and 2,190 tests before promotion.
git diff --check passed.
The normal pnpm wrapper stopped before test execution because the primary worktree's existing node_modules metadata would require a non-interactive purge; no dependency directory was removed or changed by this task.

Deploy and smoke-test the matching Works Square server endpoints before releasing a desktop build.

None; this task promotes an already accepted and documented integration candidate.