* fix(matrix): bound raw transport response reads to prevent OOM
* test(matrix): add real node:http server proof for bound transport
Two new integration-style tests drive performMatrixRequest against a real
node:http server (no stubRuntimeFetch mock) using real undici + SSRF
dispatcher and ssrfPolicy.allowPrivateNetwork:
- over-cap: server declares Content-Length > MATRIX_SDK_RESPONSE_MAX_BYTES
with maxBytes omitted → rejects MatrixMediaSizeLimitError (68 ms wall)
- under-cap: server returns small payload with maxBytes omitted → Buffer
returned correctly (12 ms wall)
Addresses ClawSweeper feedback: previous proof showed only Vitest mock
output; these tests exercise the real Matrix runtime fetch path end-to-end.
* test(matrix): satisfy lint for transport proof
* fix(matrix): preserve encrypted media download limits
* test(matrix): add streaming OOM guard proof via real node:http server without Content-Length
Drive readResponseWithLimit directly by omitting Content-Length so that
enforceDeclaredResponseSize is a no-op and the streaming byte cap is the
sole enforcement path. A 20 MiB chunked server response with a 16 MiB
cap confirms the stream is canceled before full buffering (chunksWritten
< TOTAL_CHUNKS). A second case verifies under-cap payloads pass through.
* test(matrix): fix lint errors in real HTTP server proof (curly)
* test(matrix): add under-cap proof to real HTTP server test
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