dangernoodle-io / breadboard / 25092885231

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fix(bb_http): unified streaming JSON via bb_http_resp_send_json (#146)

Adds bb_http_resp_send_json that streams documents via chunked
transfer-encoding (no contiguous serialize buffer required).
Migrates 9 JSON-emitting handlers to the new path: openapi,
manifest, info, ota_pull (×2), board, wifi (×2), log.

The previous bb_json_serialize → bb_http_resp_send pattern needed
a single contiguous heap alloc the size of the full response,
which fails on heap-fragmented consumers (TM bitaxe-403: free_heap
~82 KB but largest_free_block < 32 KB → openapi.json returns 500).
Worst-case alloc now shrinks to a single subtree.

bb_json_serialize stays for non-HTTP callers and host tests.

Closes B1-110, B1-112.

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