SPEC-299 CI reliability + SPEC-300 typed GROUP BY aggregations

[ivkan]

Summary

Lands the work completed on the sf-297-g1-settled-latch branch after PR #40
(Query Engine Consolidation Phase 1) was squash-merged. PR #40 captured only the
Phase 1 query path; the two specs below were committed afterward and never reached
main. This PR delivers both. Surfaces are disjoint (CI/client/mcp-server vs.
core-rust/server-rust query engine), so the diff reviews cleanly.

Please squash-merge — the branch carries a series of throwaway ci: TEMP diagnostic
commits whose net effect is already reverted; a squash keeps them out of main history.

---

SPEC-299 — CI reliability (root-cause fix, stopgaps removed)

The chronically-timing-out Build · Test · Lint (Unit tests) job is fixed at the source;
all stopgaps are removed. main currently still carries the stopgaps (--forceExit,
timeout -s KILL, forceExit: true) — this PR removes them.

• SingleServerProvider: clear connectionTimeoutId + pendingConnectReject in close()
  with an isClosing reconnect guard (eliminates leaked connection-timeout / reconnect-loop timers).
• TopGunClient.close() awaits provider close.
• pino sync: isTest releases the SonicBoom fd in both client + mcp-server loggers.
• mcp-server tests gain a MockWebSocket + HTTP keep-alive drain (closeAllConnections()).
• node.yml: removed --forceExit / timeout -s KILL / >>>> JEST ENTER; timeout-minutes 25→18.
• mcp-server/jest.config.js: removed forceExit: true.

~3150 tests pass locally with no --forceExit.

SPEC-300 — Typed GROUP BY field aggregations (SUM/MIN/MAX/AVG) over the wire

Single-node GROUP BY previously returned correct grouping + __count but degenerate
__sum/__min/__max (the converter hardcoded aggField = ""). This wires a real
aggregation spec end-to-end.

• New AggFunc enum + Aggregation struct + Query.aggregations wire type (core-rust).
• convert_query serializes query.aggregations; coordinator parses it back into Vec<Aggregation>;
  generalized AggregateProcessor emits __count + only the requested __<func>_<field> keys
  (conditional MsgPack Integer/F64) — degenerate-key leak eliminated.
• combine-aggregate vertex now emitted only on the multi-node path, leaving CombineProcessor
  untouched (distributed combine deferred to TODO-437/442).
• TS mirror: groupBy + aggregations on QuerySchema / QueryFilter; opaque QueryManager passthrough.
• Cross-lang golden fixtures (QUERY_SUB_GROUPBY_AGG, QUERY_RESP_AGG) + WS integration coverage
  asserting correct non-degenerate values and no key leak.

Test evidence

• Rust: cargo test --release -p topgun-server --lib — 1291 tests; cargo test -p topgun-core — 12 + 7 doc.
• clippy --all-targets --all-features exit 0 on both crates; cargo fmt --check clean.
• TS: @topgunbuild/core + @topgunbuild/client build; cross-lang fixtures + WS integration green.

Both specs were reviewed and APPROVED via the SpecFlow impl-review gate (0 critical / 0 major).

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