Ignore the reserved bit in PUSH_PROMISE identifiers - #171
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Mask the reserved bit in PUSH_PROMISE stream IDs when reading and writing frames, matching the existing handling of GOAWAY and WINDOW_UPDATE. RFC 9113 section 6.6 defines a 31-bit promised stream identifier. Without the mask, a peer-set reserved bit leaks into the parsed ID, and the reserved bit alone bypasses the zero-ID check.
Seven regression cases fail before the fix and cover padded/unpadded parsing, zero-ID rejection, and serialization. Full tests pass with 100% branch coverage; source Ruff and strict mypy checks pass.
Specification: https://www.rfc-editor.org/rfc/rfc9113.html#section-6.6