fix(ios): make snapshot presentation construction private

[thymikee]

Summary

Related to #1797.

The merged #1930, #1931, and #1933 prerequisites establish backend conformance, effective geometry, and daemon-owned occlusion. This focused slice closes the remaining construction-boundary gap:

• Moves PresentedNode under SnapshotPresentation.
• Preserves the existing PresentedNode spelling at the payload boundary with a typealias.
• Makes all interpretation initializers fileprivate in RunnerTests+SnapshotPresentation.swift, so backend files can carry presentation output but cannot recreate it.

This PR does not touch the #1936 scanner or package-boundary files.

The broader #1797 obligations remain intentionally separate: the cumulative-clip choke and named quality downgrade, deterministic differential fixtures and multidimensional ratchets, nightly live differential wiring, cross-runtime golden conformance, and the visible-depth frontier.

Validation

• Planted-red compiler proof: a temporary direct PresentedNode(presenting:) call in RunnerTests+PrivateAXPresentation.swift failed the macOS XCTest build at the backend source with the inaccessible-constructor diagnostic; removing that violation restored the build.
• Unit-enabled direct macOS XCTest build passed after the violation was removed.
• pnpm check:xctest-selection passed.
• pnpm check:affected --run passed with exit 0. The pre-existing untracked .codex/environments/ path caused the selector to fail open to the full runnable set; the rerun used process-table access required by the sandbox.
• pnpm build:xcuitest:macos passed.
• pnpm build:xcuitest:ios passed.

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	2.36 MB	2.36 MB	0 B
JS gzip	790.2 kB	790.2 kB	0 B
npm tarball	908.1 kB	908.3 kB	+117 B
npm unpacked	3.15 MB	3.15 MB	+556 B

npm unpacked components

Component	Base	Current	Diff
JS / dist source	2.50 MB	2.50 MB	0 B
Apple runner source/project	547.8 kB	548.4 kB	+556 B
macOS helper source	54.5 kB	54.5 kB	0 B
Android helper artifacts	0 B	0 B	0 B
Other package files	41.9 kB	41.9 kB	0 B

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	27.6 ms	27.6 ms	+0.0 ms
CLI --help	83.0 ms	79.8 ms	-3.1 ms

Top changed chunks: no changes in the largest emitted chunks.

Top changed packed files

Packed file	Base	Current	Diff
dist/apple/runner/AgentDeviceRunner/AgentDeviceRunnerUITests/RunnerTests+SnapshotPresentation.swift	8.4 kB	10.2 kB	+1.9 kB
dist/apple/runner/AgentDeviceRunner/AgentDeviceRunnerUITests/RunnerTests+SnapshotPresentationModels.swift	4.3 kB	3.0 kB	-1.3 kB

[thymikee]

Clean review at d82bd8d. PresentedNode construction is now owned by SnapshotPresentation, while payload encoding and the explicit single-element read paths remain intact. The compiler-boundary proof is non-vacuous, and all required CI plus iOS/macOS/Android/Linux smoke checks are green. Ready for human review.

[github-actions]

PR Preview Action v1.8.1
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2026-08-21 14:51 UTC