MushroomObserver / mushroom-observer / 29178706417

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Pull #4772

github

Parallelize lang.rake's multi-language export/import/update/strip/check tasks

lang:update runs standalone (CI, a git hook, or a developer directly) with no
Solid Queue workers running, so the per-language work in the :all/:unofficial
rake tasks can't be a background job -- it has to parallelize in-process.

Extracts the pool logic into ConcurrentEachWithConnection (app/classes/), a
normal Zeitwerk-autoloaded class instead of rake-file-local top-level defs,
so it's unit-testable (test/classes/concurrent_each_with_connection_test.rb
covers: runs every item, gets its own active DB connection per item, re-raises
the first error only after every item finishes, and correctly processes more
items than the pool size).

Each Language's export/import/update/strip/check work is independent (its own
instance variables, its own per-locale files) -- the only shared state is
Language.verbose/safe_mode/locales_dir, set once by the :setup prerequisite
chain before this runs and never written to during it, so concurrent reads are
safe.

Measured ~30% wall-clock reduction on lang:update (11.8s -> ~8.2-8.5s,
consistent across repeated runs).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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