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feat: add bb_data_http SSE/WS push transport host core (#919)

PR-2 of the Model-B egress stream (B1-1033, design KB 1443/1444): the
host-testable pure core for bb_data_http, the converged HTTP SSE/WS push
transport that will replace bb_event_routes. Dep-light (bb_queue + bb_core
only) -- render/generation/send are injected fn-pointer seams so this
component never links bb_data or bb_ws_server directly.

- composition-root-owned attach table (key -> topic mapping, bb_data stays
  topic-agnostic)
- fd-table client pool with topic_filter (exact match / NULL=all) and
  per-client outbound bb_queue (byte-budget backpressure, B1-1031)
- bb_data_http_sweep_step(): STATE dirty-mask detect/coalesce/drain, with
  the clear-before-render lost-wakeup ordering invariant proven by a
  dedicated host test
- EVENT replay (B1-1032) is a deliberate no-op stub, deferred to PR-3

No FreeRTOS task, no httpd, no real sockets in this PR -- the espidf
broadcaster backend is the HW-gated cutover, B1-1045.


Claude-Session: https://claude.ai/code/session_01VA9XvWjJcbAUGCZpSFfp3H

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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