User-approved draft from the platform-canon survey discussion: binary
modpod .tm are one-platform-per-file under per-platform TM ROOTS the boot
registers for the running platform only (punk::platform canon names).
Context records the motivating fat-tm evidence (oversized downloads;
same-version shadowing with no drop-in path), the subdirs-are-namespace-
components constraint forcing sibling roots, and the division of labour
with G-109 (manifest target-platform field stays there). Deliberately
dormant until binary-.tm distribution starts - no speculative structure.
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com