test(ios): stream a leased physical iPhone's screen

[V3RON]

Closes #619

Status

Red stage: the spec's tests are written and fail on named assertions. No implementation beyond two optional option fields (deviceCommand) so the tests compile.

Done when

• The tests above pass.
• pnpm build on this Mac (Xcode 27) puts both programs in dist/bin/.
• Slow lane: e2e/slow-ios-stream.test.ts passes; the stream cases in e2e/slow-ios-physical.test.ts pass on a real iPhone that meets the Physical iOS row's checks, the two new ones included; the lock case in e2e/slow-ios-physical-manual.test.ts passes with a person at the iPhone.
• GET /v1/stream/leases/{leaseId} for a physical iPhone no longer answers 415.

Assumptions

• Assumption: how the physical-lane stream claims are grouped into tests — one test for the version table, one for "642.x goes on, an unknown UDID exits 1 within 26 s", one long test for stream + still screen + second viewer + no-capture-left-and-restream, and the lock case in the manual lane. Grouping the lease-backed claims keeps one lease and one rig for the whole lifecycle, as the existing stream lanes do; a separate test per claim would lease the same iPhone four times, which is slower and harder to pin.
• Assumption: "the suite fails, not skips, when dist/bin/simlock-device-capture is missing" — it is its own test ("the device capture program is built") rather than a guard inside describe.skipIf. Every other test in the file then fails on its own missing-program error too; an assertion in a test is the shape the suite already has for a broken build, and it keeps describe.skipIf about the machine's fitness, not the checkout's.
• Assumption: how the build test makes one Swift product fail — a SIMLOCK_FAKE_SWIFT_FAIL name list read by the test's own fake swift. The fake is the test's own helper, so a variable of its own invents no surface; it is the smallest way to have one product build while the other does not.
• Assumption: the stream-envelope reader both iOS stream lanes need — moved to e2e/helpers/screen-frames.ts and re-exported from the helpers barrel, with slow-ios-stream.test.ts reading it from there. Sharing one copy keeps the two lanes' claim about "meta, an avcC description and a key frame" one claim (testing rule 7); the code itself is unchanged.

This PR is stacked on #622 (feature/617-adr): the ADR and its PoC, which this spec cites as poc/, are on that branch.

Written by an agent.