prisma-risk / tsoracle / 26410395975

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test: raise library coverage to 95.5% with targeted tests (#414)

Adds genuine behavioral tests for previously-uncovered reachable paths, and
installs TRACE-level subscribers in the tests that already exercise tracing
sites. Under `cargo llvm-cov --all-features` the `tracing` feature is on but no
subscriber is installed, so `tracing::{debug,warn,info}!` short-circuit before
evaluating their field expressions, leaving those arg lines uncovered even
though the code path runs; a test subscriber makes them format (and verifies
the instrumentation does not panic).

- client retry: new tests for the connect-timeout arm (paused-time slow
  connector), the decode-error arm (in-process server returning a count
  mismatch), and the overall-deadline break; subscriber coverage of the
  classify/dispatch/redirect tracing fields
- server: extend the core_status mapping test to the two missing CoreError
  arms; serve() and WatchGuard::abort() behavioral tests; SIGTERM/SIGINT tests
  for shutdown_signal() in their own isolated test binaries so a process-wide
  signal cannot perturb other tests
- e2e kube tracker: report()/Default tests
- paxos driver: host() accessor and fail-closed warn coverage
- coverage config: exclude the kind e2e binary entrypoint (it dials a live
  cluster; only the kube e2e lane runs it), keeping tracker.rs measured

Line coverage 94.27% -> 95.49%; clippy -D warnings and fmt clean.

145 of 152 new or added lines in 4 files covered. (95.39%)

9643 of 10015 relevant lines covered (96.29%)

518514.02 hits per line