[exec-server] Add bounded file reads#29441
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Context
This is PR 1 of a five-PR prerequisite stack for CCA-50 and the CCA file-transfer RFC.
The previous whole-file relay approach in #28337 can exceed the 64 MiB Noise message limit and puts file bytes on the CCA control plane. The replacement architecture keeps file bytes inside the selected executor. Its first prerequisite is a bounded filesystem read that works identically through both direct and sandbox-helper paths.
Stack order:
What changed
maxBytestofs/readFilewithout changing legacy callers.This PR does not add file-transfer RPCs or enable any new CCA behavior.
Test plan
just test -p codex-exec-server --test bounded_read(1 passed)cargo check -p codex-exec-server(passed during exact-stack validation)Reviewed as part of the complete stack by independent architecture, security, and Rust/conventions reviewers; no P0/P1/P2 findings remain.