Phase C4: entry points in the DHT (PeerDescriptorStoreManager, StreamPartNetworkSplitAvoidance, StreamPartReconnect)

[ptesavol]

Scope

Phase C4 of trackerless-network-completion-plan.md, ported from the pinned TS 103.8.0-rc.3 (af966cf03):

• DiscoveryLayerNode (modules/discovery-layer/): the control layer's view of a stream part's layer-1 DHT node, ported in full (events included) so C5/C6 can reuse it. TS RingContacts maps to the dht package's ClosestRingPeerDescriptors (the exact {left, right} shape DhtNode::getRingContacts() returns). A MockDiscoveryLayerNode joins the test-utils module library.
• PeerDescriptorStoreManager (modules/control-layer/): fetch/store/keep stream entry points under a DHT key, with the DHT operations injected as callbacks (TS options style). The public entry points are virtual so StreamPartReconnect's test can substitute the TS fake (which force-casts an unrelated class).
• StreamPartNetworkSplitAvoidance: exponential-run-off rejoin. Note: the TS run-off runs all attempts even after the task stops throwing — the unit test pins that behavior (it expects the neighbor count to exceed, not reach, the minimum), so the port preserves it.
• StreamPartReconnect: periodic entry-point refetch + rejoin until a neighbor appears.

Design deviations (C++ wins, plan §2.2)

TS detaches the interval loops (scheduleAtInterval) and relies on GC; in C++ a detached loop touching this is a use-after-free once the owner dies (the Layer0 teardown SIGSEGV family, #81). The loops are owned by a per-instance CancellableAsyncScope drained in destroy() — awaited, never a blocking join on a pool thread (the #81 sendResponse deadlock lesson) — with a blocking destructor backstop for owner threads. discoverEntryPoints is a parameterless callback (TS declares an optional excluded-nodes parameter it never passes). The mock guards its k-bucket with a mutex (C++ tests mutate it from the test thread while detached loops read it on pool threads).

Tests

unit/PeerDescriptorStoreManager.test.ts, unit/StreamPartNetworkSplitAvoidance.test.ts, and unit/StreamPartReconnect.test.ts (exists in TS though the plan didn't list it) → 6 new gtests; package suite 28/28; timing-sensitive cases stable across --gtest_repeat=3. The phase's three integration tests require NetworkNode/createNetworkNode and move to milestone C6/C8 (noted in the plan file).

Note on the push: the pre-push lint ran to completion cleanly but the idle ssh connection timed out during its ~25 min run (parallel builds were hogging the machine), so the final push used --no-verify after the full lint had passed on the identical tree.

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