docs(adr): record PDF DOM design traceability

[seonghobae]

Summary

• record the required Figma File ID in ADR-0005
• explicitly mark the backend-only PDF DOM upload contract as having no visual surface
• keep this one-line documentation fix stacked on fix(data): align PDF DOM upload budget with sidecar #1427

Verification

• git diff --check
• exact parent: 795bfd2c05d6003aacedad043105a15f194687af

Parent PR: #1427

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[seonghobae]

@opencode-agent @cwl-noema-review

Current-head review request for documentation-only stacked PR #1446.

Exact head: 1ce64ae
Parent/base branch: codex/pdf-dom-upload-64m at 795bfd2

Verify the complete one-line ADR change: it records the required Figma File ID and states that the backend PDF DOM upload contract has no visual surface. Confirm no upload, decoder, parser, security, or runtime behavior changed. Return a current-head path:line verdict; do not reuse predecessor evidence.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.