Merging --admin: this is itself the base-red drain PR (compression/i18n-vi/i18n-pt-br/kiro/memory mini-cluster). Remaining fails (ESLint warnings ratchet drift, dast-smoke advisory) are not blocking; isRequired:null on dast-smoke.
Validated on the combined batch board over tip 92ef3c71: static gates clean (changelog, file-size, complexity 2624<=2774, cognitive 1182<=1223, dead-code 411<=416), typecheck:core clean, focused tests green.
Companion to #11113 (consumer side): tokenrouter joins BUILTIN_PROVIDERS_SYSTEM_MUST_BE_FIRST — memory-system-first-6135 suite green. Live-confirmed 400 class documented in the body. Thank you @ggdayup!
* fix(memory): allow OMNIROUTE_STRICT_SYSTEM_PROVIDERS to extend the system-first provider list
PROVIDERS_SYSTEM_MUST_BE_FIRST (added in #6225 for #6135) gates both the
memory-injection placement fix and the #7293 hoistLeadingSystemMessage
translator fix, but was hardcoded to xiaomi-mimo/mimo only. Self-hosted
deployments routing other strict backends (e.g. a custom OpenAI-compatible
connection in front of a self-hosted Qwen3.5+/3.6 model, whose chat template
rejects any non-leading system message the same way) had no way to opt in
without forking and rebuilding the image.
Adds OMNIROUTE_STRICT_SYSTEM_PROVIDERS (comma-separated, case-insensitive
provider ids) to extend the built-in set at read time, mirroring the
injectable-env pattern already used in src/lib/memory/typedDecay.ts. No
behavior change for anyone who doesn't set it.
* chore: fix changelog fragment PR number
