fix(resilience): restore expired-connection retry-budget probe in health sweep (#11672)

Merged via /merge-batch (2026-08-26, v3.8.51). Boarded no worktree combinado; validação única: typecheck/complexity/cognitive-complexity/file-size/changelog verdes, lint nos mesmos 228 achados pré-existentes confirmados contra o tip puro, testes focados passando. Obrigado pela contribuição.

changelog.d/fixes/11592-token-health-retry-budget-boundary.md

@@ -0,0 +1 @@
+- **resilience:** restore the expired-connection retry-budget probe in the token-health sweep — the `!isGitHubAccessTokenOnlyConnection` carve-out reintroduced by #11608 contradicted the boundary pinned by #11592, so a GitHub connection parked at `expired` with retry budget remaining was never probed and could never self-heal ([#11592](https://github.com/diegosouzapw/OmniRoute/pull/11592)).

src/lib/tokenHealthCheck.ts

@@ -599,13 +599,6 @@ export async function checkConnection(conn) {
   const isRecoverableExpiredWithRetryBudget =
     conn.testStatus === "expired" &&
     conn.lastErrorType !== "account_deactivated" &&
-    // GitHub access-token-only connections have their own dedicated exemption
-    // (isRecoverableGithubCopilotNoRefresh above): ONLY the exact
-    // "no_refresh_token" shape self-heals. An "expired" GitHub connection for a
-    // different reason (e.g. invalid_grant) is genuinely terminal and must stay
-    // skipped, otherwise the generic retry-budget exemption below reopens #8182's
-    // wasted-probe fix for every "expired" GitHub connection.
-    !isGitHubAccessTokenOnlyConnection(conn) &&
     getExpiredRetryCount(conn) < EXPIRED_RETRY_MAX;
   const terminalStatuses = new Set(["credits_exhausted", "banned", "expired"]);
   if (