/api/health needs X-Secret-Key but stays outside the rate limit. Only the admin key gets load_errors from /api/services, default error details no longer name the exception class, and a prepare signal replaces aiohttp's Server banner on every response while the CDM routes keep their own.
Cloudflare replaces an origin 502 body with its own page, so clients got "502: Bad gateway" in place of the error and resent each failed licence.
BREAKING CHANGE: SERVICE_ERROR and DRM_ERROR now return HTTP 422 instead of 502.
Handlers share one service instance, so a per-session lock keeps two requests out of it at once. Track threads merge and write job state under one lock, and the progress sink coalesces ticks that say the same thing.
Renames 314 defs and 41 module/class-level constants. Keeps 11 names underscored where the stripped form collides in scope, plus 5.5.0 shims for the three symbols external service repos call.
Covers RemoteClient/RemoteService, REST routes, handlers, SessionStore, InputBridge, DownloadQueueManager, errors, compression, and serve CLI. E2e tier opts in via --live and can auto-spawn its own serve.
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