[SatsAndSports]

Summary

• make vendored H2 treat SETTINGS_MAX_HEADER_LIST_SIZE as an inclusive maximum
• accept exactly 32,768 RFC-accounted header-list bytes while continuing to reject 32,769
• add direct vendor and MONAD client/server boundary regressions
• bump the vendored fork to h2 0.4.16+monad.2 and update its diff inventory

Rationale

MONAD advertises a 32 KiB maximum and the protocol permits lists within that value. Vendored upstream H2 used >= when marking a decoded list oversized, so an exactly 32,768-byte list was incorrectly rejected. Increasing the configured value would advertise the wrong limit; this instead fixes the decoder comparison.

Verification

• cargo test --manifest-path vendor/h2/Cargo.toml frame::headers::test
• cargo test --manifest-path vendor/h2/Cargo.toml --test paused_flow_control
• focused monad-common client/server boundary tests
• cargo test
• make lint
• make stress-tiny
• git diff --check