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feat: bb_cache canonical state-topic cache + shared serializer (B1-356) (#562)

makes retained SSE 'state' events drift-proof against REST by construction:
each state topic owns one cached canonical struct + one serializer; the SSE
event-post and the REST handler serialize the SAME cache via the SAME fn, so
event payload == REST payload always. registration is the only path to emit a
state topic, so split builders cannot be reintroduced. closes the B1-352 drift
class structurally.

- new bb_cache component (register/update/post/serialize_into); REQUIRES bb_core bb_json bb_event
- route net.health, diag.boot, update.available, health.display through bb_cache; delete their split SSE builders
- canonical shapes = REST superset (union): net.health drops the `full` flag (SSE now full shape); diag.boot SSE restructures flat->nested; update.available SSE gains last_check_ok/enabled/outcome/last_check_ts and REST gains ts; health.display SSE gains width/height/enabled
- diag.boot: drop redundant panic.reset_reason (duplicated top-level reset_reason)
- per-topic ring max_entry override (bb_event_routes_attach_ex2); size update.available retained ring to 512 B (union payload ~430 B); global ring cap unchanged at 256
- host equality harness (test_bb_cache_fidelity) asserts event==REST byte-equality across all four topics
- ci: guard against state-topic bb_event_post outside bb_cache

BREAKING (SSE consumers): diag.boot SSE payload restructured flat->nested; net.health/update.available/health.display SSE payloads gained fields (additive). TaipanMiner consumers must raise CONFIG_BB_EVENT_ROUTES_RING_MAX_ENTRY 128->256 and tolerate the new diag.boot shape (tracked separately).

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