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houseplan-card/tests_backend
Codex c90f5bf052 perf: junction limits scale — executor, rev cache, linear П3/П4, shared masonry pass (#330)
Six cuts, zero verdict changes (spec §3; equivalence pinned by units, the
parity suite and the smokes):

- §4.1 the CPU chain of ws_config_set and ws_plan_optimize runs in the
  executor; write_lock still serialises writes, only the HA event loop is
  freed (2.8 s of blocking per 576-atom write before).
- §4.2 the stored document's violation counts are cached on the runtime by
  rev (store.py junction_baseline); a repeated write never re-judges
  `previous`. validate_junction_limits takes baseline_counts and returns the
  candidate's counts to cache after a successful save.
- §4.3 П3 builds its node index once per check in both mirrors
  (289→11 ms TS, 285→~50 ms py).
- §4.5 П4 uses a bucket grid with the threshold as cell size in both
  mirrors (104→19 ms TS, 372→44 ms py); pair enumeration switches to
  lexicographic order — same verdict set, equivalence pinned against a
  brute-force oracle on cell borders.
- §4.6 a document already carrying the current catalogue is judged as-is:
  a no-op re-migration cost 815 ms py / 69 ms TS. Legacy documents migrate
  exactly as before (the #329 H1 test stays green).
- §4.7 П5 shares one junction-topology pass per check and pays the masonry
  union only when multi-wall nodes exist — and the resize path hands over
  the preflight's own artifact, so a pointermove never builds the union
  twice (4.2 s → 88 ms full candidate on the benchmark grid).

The frontend baseline is cached per (document identity, config epoch): ten
pointermoves make N+1 limit computations, not 2N — pinned by the smoke on a
real pointer gesture.

demo/benchmark_junction_limits.mjs (npm run benchmark:junction-limits) pins
the budgets for both mirrors: TS full candidate ≤100 ms (measured 88), py
warm validate ≤250 ms (measured 45), cold legacy ≤3.5 s — that path is
one-off and lives in the executor.

Issue: #330
User-Visible: yes
2026-08-28 03:07:11 +03:00
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2026-08-11 22:12:08 +03:00