[plainprogrammer]

Retires spec 057's plan now that #282 has merged (e90b3a22). Done by the distill-feature skill, following spec 027 D4 and D7.

• 20bb9518 deletes docs/specs/057-deck-design-rules/plan.md and changes nothing else.
• 4a6de836:
  • adds the spec's **Plan:** pointer under its **Frozen:** line;
  • sets the index row's Plan cell to the pointer;
  • replaces the one Markdown link to plan.md (in verification.md's header) with plain text that points to the retired plan.
• b5d4a689 swaps the "spec 057's pull request" placeholder in the catalog-core.md and collection-and-lots.md distillation logs for a link to Design system: deck rules, navigation and pickers (#248) #282.

Checks

• git show 20bb9518^:docs/specs/057-deck-design-rules/plan.md prints the plan.
• No Markdown links to plan.md are left in the spec's folder.
• No placeholders are left in the area or design-system docs. The one still in verification.md records the distillation as it happened.

Merge with a merge commit, so 20bb9518 stays in main's history.

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