[plainprogrammer]

Follow-up to #110 (spec 027, merged at f831bf2): spec 027's index row read "retirement owed". This retires its plan using the distill-feature after-merge procedure, the same way 015 and 024 were retired in #110.

• c1ef5f0 deletes docs/specs/027-architecture-area-docs/plan.md and changes nothing else.
• The next commit points to it (spec 027 D4):
  • the spec header gets the line **Plan:** retired in `c1ef5f0138c6898ab171fe6315281e6fed5c86c2`; read it with `git show c1ef5f0138c6898ab171fe6315281e6fed5c86c2^:docs/specs/027-architecture-area-docs/plan.md`
  • the plan link in verification.md line 3 becomes plain text
  • the index row changes to Status Shipped (it was Approved) and Plan retired, with the pointer

Checks: git show c1ef5f0^:docs/specs/027-architecture-area-docs/plan.md prints the plan, and git show --stat c1ef5f0 lists only the deleted plan. The existing pointers for 015 and 024 resolve (git cat-file -e). bin/ci passes (1507 examples, 0 failures).

Merge with a merge commit, not squash or rebase. The pointer names c1ef5f0, a commit on this branch, so it has to stay in main's history (docs/git-convention.md, Merging).

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