OOM hardening and memory tuning.
- Transport::inbound(): pre-emptive cull before destination-table insert;
try/catch around insert for explicit OOM diagnostics - Transport::jobs(): split stale-entry culling into 5 independent
per-phase try/catch blocks so a failure in one phase doesn't abort
the others; reserve() before push_back loops in each phase - cull_path_table()/cull_known_destinations(): std::min_element fallback
when sort-index allocation fails, breaking the cull-OOM-still-full loop - Identity::remember(): wrapped _known_destinations.insert in try/catch
for explicit OOM diagnostic logging - Destination::announce(): outer try/catch covers all OOM-prone ops
(Bytes concat, sign, Packet ctor, send); inner _path_responses.insert
catch preserved for degraded-mode behavior - Packet::unpack(): dedicated std::bad_alloc catch returns false cleanly
- Type.h: MAX_RECEIPTS and MAX_QUEUED_ANNOUNCES now overridable at
compile time via RNS_RECEIPTS_MAX / RNS_QUEUED_ANNOUNCES_MAX - Transport.h: hashlist_maxsize and max_pr_tags exposed as runtime
accessors for dynamic capacity tuning - Added more defines for setting storage and persistence limits (RNS_RATE_TIMESTAMPS_MAX, RNS_RANDOM_BLOBS_PERSIST_MAX, RNS_RANDOM_BLOBS_MAX)