docs(track-a): archive worldmap mutation design task

[blakinio]

Lifecycle-only closeout for completed task OTC-20260817-track-a-worldmap-mutation-design after implementation/design PR #452 merged as 1e6fcb5ab83c4bb8b762088326cc936857c8e64d.

This PR only:

• moves the task record from docs/agents/tasks/active/ to docs/agents/tasks/archive/;
• records exact-head docs(track-a): design worldmap extent mutation validation #452 validation (32012167450, 32012167552, CI / Required job 95333948618, all SUCCESS);
• releases task ownership.

It does not change the promoted design, execute or modify the official client, access runtime state, or authorize physical mutation.

Terminal design boundary remains:

MUTATION_DESIGN_READY: true
SAFE_MUTATION_PROVEN: false
PHYSICAL_VALIDATION_CONTRACT_READY: true
PHYSICAL_VALIDATION_EXECUTION_AUTHORIZED: false
client_byte_mutation_authorized: false

E2E: NOT_APPLICABLE — lifecycle documentation only.

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