[plainprogrammer]

Housekeeping after the merge of #341 (spec 079, the deck checks). Documents only.

• docs(specs): retire the plan of spec 079 deletes docs/specs/079-deck-checks/plan.md and changes nothing else (git show --stat 2086fd14).
• docs(specs): point to the retired plan of spec 079 (spec 027 D4) adds the **Plan:** pointer under the spec's header, sets the index row's Plan to "retired in 2086fd14…", and replaces the one link to plan.md in verification.md with plain text. git show 2086fd14^:docs/specs/079-deck-checks/plan.md prints the plan (checked).
• docs(architecture): name the pull request of spec 079 in the distillation log replaces the placeholder "spec 079's pull request" with #341.
• docs(architecture): list every spec the collection-and-lots doc covers: the "Specs it covers" cell in docs/architecture/README.md stopped at 073. The specs index names sixteen more rows frozen by that doc (038, 040, 042, 048, 059, 061, 064, 065, 067 to 071, 077 to 079); they are added, with a short qualifier only where the spec's own name gives one. Not part of spec 027's steps, noticed while distilling feat(decks): check a deck's size, copy limits and owned plus proxy (spec 079, #258) #341.

bin/yard doc --no-cache builds with no warnings. No code, no migration, no spec behaviour changes.

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