[dezren39]

Closes #542

F11.9 bytes-per-frame baseline: adds a rerunnable sandbox measurement test and commits the baseline table F12.11 delta frames must beat.

Measurement (pkgs/id/src/sandbox.rs, test bytes_per_frame_baseline_for_checked_in_examples): instantiates each of the 7 checked-in example wasms in the Sandbox with seed 7 and records the full-screen frame byte length at 80x24 and 200x60 via layout_at (which falls back to view() for guests without plaza_layout; the test asserts that fallback invariant and the printed table marks it).

Table (doc/2026-10-27T00-00-00Z_baseline_bytes_per_frame.md, measured at 37418e5):

example	plaza_layout	bytes @ 80x24	bytes @ 200x60
lounge	yes	29	29
roc-chat	yes	24	24
roc-counter	yes	7	7
roc-grid	yes	383	383
roc-screen	yes	179	179
territory	yes	1010	1010
tic-tac-toe	yes	25	25

All 7 export plaza_layout (no fallback used); at rest each frame is the same length at both viewports — recorded in the doc as a baseline datum. Baseline is guest frame bytes at the sandbox boundary; presenter wire encodings (surface JSON / ANSI) are explicitly out of scope in the doc.

Tests (laptop, pkgs/id):

• cargo test --lib bytes_per_frame_baseline -- --nocapture — pass, table printed
• cargo test --lib sandbox:: — 30 passed
• cargo test --lib world_fixture — 15 passed

Rerun: cd pkgs/id && cargo test --lib bytes_per_frame_baseline -- --nocapture

Queue task 1313.

---

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-27T15:33:22.979111Z	08b8882	New commits

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