Tune SQLite pragmas to reduce lock contention#12
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Adds temp_store/cache_size/wal_autocheckpoint tuning on top of Rails' built-in WAL defaults, ties pool size to RAILS_MAX_THREADS, and loosens synchronous/mmap_size/timeout in test to address the SQLite lock contention that PARALLEL_WORKERS=1 currently works around.
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Summary
temp_store,cache_size, andwal_autocheckpointSQLite pragmas inconfig/database.sqlite.yml, on top of Rails' built-in WAL/synchronous defaults.RAILS_MAX_THREADS(defaulting to 5, matching current behavior).timeout/synchronous/mmap_sizefor the test environment to reduce lock contention during parallel test runs (thePARALLEL_WORKERS=1workaround mentioned in AGENTS.md).Test plan
bin/rails runnerin development, test, and production environmentsbin/rails test test/modelswith default parallelization; no new failures introduced (3 pre-existing failures reproduced identically without this change)