Phase C7: inspection (Inspector, InspectSession)

[ptesavol]

Scope

Phase C7 of trackerless-network-completion-plan.md, ported from the pinned TS 103.8.0-rc.3 (af966cf03). Taken out of order: C7 depends only on C1's temporary-connection RPC (plus ListeningRpcCommunicator, ConnectionLocker, waitForEvent) — not on C2/C3 — so it can land while neighbor discovery (C2) is still in flight in its own branch.

• InspectSession (modules/logic/inspection/): tracks which messages seen during an inspection were also delivered by the inspected node, emitting Done as soon as that node proves it forwards traffic. TS toUserId(publisherId) in the message key becomes lowercase hex via BinaryUtils.
• Inspector: opens a temporary connection to the inspected node (defaults: TemporaryConnectionRpcRemote open/close + weak connection locks; overridable callbacks like the TS options), waits for the session's Done under the inspection timeout, and returns the TS verdict formula (success || no messages seen || only marked by inspected node).

C++ deviations

The session/inspector maps are mutex-guarded — TS is single-threaded, here markMessage() arrives from delivery threads while inspect() reads the counts — and Done is emitted outside the locks (listeners such as waitForEvent take their own).

Tests

unit/InspectSession.test.ts and unit/Inspector.test.ts → 5 gtests (the TS Promise.all([waitForEvent, markMessage]) pairs become folly collectAll; the jest setTimeout a helper thread). Stable across --gtest_repeat=3; package suite 33/33; dht unit 181/181 on the rebased tree. integration/Inspect.test.ts and end-to-end/inspect.test.ts need NetworkStack/full node and move to C6/C8 (noted in the plan file).

Push note: full ./lint.sh ran standalone with exit 0 on this exact tree; the push used --no-verify to avoid the documented idle-ssh timeout during the long in-hook lint.

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