[plainprogrammer]

Summary

Retires the plans of spec 025 (import preview, merged in #113) and spec 026 (add by number, merged in #114), following the distill-feature skill and spec 027 D4/D7, the same way #112 retired spec 027's plan.

For each spec, two commits:

• docs(specs): retire the plan of spec NNN deletes plan.md and nothing else.
• docs(specs): point to the retired plan of spec NNN (spec 027 D4) adds the **Plan:** retired in <sha> line to the spec's header, replaces the plan.md link in its verification.md with plain text, and sets the index row to Shipped with the pointer.

Spec	Deleting commit	Read it with
025	f62edb57955f78aca0836e16b3129e9cb29219ea	git show f62edb57955f78aca0836e16b3129e9cb29219ea^:docs/specs/025-import-preview/plan.md
026	6b18cd6bf263afe0761e78b43f48772a362fafed	git show 6b18cd6bf263afe0761e78b43f48772a362fafed^:docs/specs/026-typed-entry/plan.md

Nothing else in either spec changes. Their areas have no area doc yet (issues #108 and #109), so neither is marked Frozen; the area slices will distil them.

Merge with a merge commit (not squash or rebase). The pointers name commits on this branch; a squash or rebase would drop them from main's history and break git show <sha>^:….

Verification

• Both git show <sha>^:<path> commands print the plans; git show --stat of each deleting commit lists only that plan.
• bin/ci passed in the worktree (1671 examples, 0 failures, 1 pending).

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