[24/36] Add OC-120 preview media controls task

[cjohnsto-nz]

Summary

Adds the supervisor planning task for preview zoom and rotate controls, including the goal prompt and task-index updates that define OC-120 scope.

Ownership

• This PR defines the OC-120 task; it does not claim implementation.
• Implementation follows in PR [26/36] Add OC-120 preview media controls #58 (feature/oc-120-preview-media-controls), beginning at e9e45b0.

Stack

• Base: PR [23/36] Retire tracked PDF asset normalization #64 (supervisor/pdf-asset-normalization)
• Head: supervisor/add-preview-zoom-rotate-task
• Immediate child: PR [25/36] Add OC-130 protocol layout stability task #62 (supervisor/add-protocol-layout-stability-task)

Validation

• Task numbering and goal-prompt wiring reviewed.
• Referenced preview surfaces and test seams match the later PR [26/36] Add OC-120 preview media controls #58 implementation.
• GitHub reports this PR and its immediate child as mergeable.

[APKiwi]

Verdict: approve. The referenced surfaces (renderPreview, response.ts, requestPanel, the pdf.js assets, the suggested test seams) all line up with what the implementation PR actually built, and the numbering/goal-prompt wiring is consistent.

[cjohnsto-nz]

The approval is accepted. No source change belongs on this branch.

PR #57 defines the OC-120 task, prompt, and ledger wiring. The implementation is owned by PR #58 (feature/oc-120-preview-media-controls), beginning at e9e45b0 and completed by the subsequent OC-120 commits on that branch. Adding preview code here would duplicate that ownership and increase stack conflicts.

I corrected the malformed PR body: the literal PowerShell placeholders are gone, the base/head/immediate-child branches are explicit, and the validation section now describes this documentation-only scope instead of implying that implementation artifacts belong here.

The upstream PR #64 retirement remains clean through this branch, and GitHub reports PR #57 and immediate child PR #62 as MERGEABLE/CLEAN with all checks passing.