refactor(snapshot): move text-surface into snapshot presentation

[thymikee]

Summary

Move the snapshot text-surface policy and its test from src/utils into the existing src/snapshot/snapshot-presentation owner.

Update the three production importers and move the path-keyed Fallow baseline entry. The production module is byte-identical and no runtime behavior changes.

Closes #2133

Validation

• pnpm vitest run src/snapshot/snapshot-presentation/text-surface.test.ts
• pnpm vitest run src/commands/interaction/runtime/selector-read.test.ts src/daemon/handlers/__tests__/interaction-read.test.ts
• node --experimental-strip-types --test scripts/layering/snapshot-presentation-boundary.test.ts
• pnpm format
• pnpm check:affected --run — all runnable checks passed; native, device, coverage, and other GitHub-authoritative lanes remain for CI.
• Independent adversarial review: READY, no code-level blockers.

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	2.51 MB	2.51 MB	0 B
JS gzip	841.4 kB	841.4 kB	0 B
npm tarball	968.2 kB	968.2 kB	0 B
npm unpacked	3.35 MB	3.35 MB	0 B

npm unpacked components

Component	Base	Current	Diff
JS / dist source	2.67 MB	2.67 MB	0 B
Apple runner source/project	581.1 kB	581.1 kB	0 B
macOS helper source	54.8 kB	54.8 kB	0 B
Android helper artifacts	0 B	0 B	0 B
Other package files	45.6 kB	45.6 kB	0 B

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	31.3 ms	32.2 ms	+0.9 ms
CLI --help	82.1 ms	83.0 ms	+1.0 ms

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

Top changed packed files

No changed packed files.

[thymikee]

Review found no code or ownership-design issues. This is the intended smallest #2129 child: the byte-identical text-surface policy and its test move into ADR 0004's existing snapshot-presentation owner, the three declared consumers follow it, and no utils shim or public surface remains. The existing snapshot-facet boundary test continues to provide the named positive control. Exact-head CI, native Smoke, Coverage, Repo Guards, and Size are all green.