feat(arr): reconcile subtitle gaps in the daemon

Closes each unsatisfied wanted language per DESIGN.md §8/§15: embedded
tracks satisfy for free (recording them as #189 left to this issue),
then provider search + ranked fetch + alass sync + sidecar write, then
immediate machine translation — extracting a text-format embedded track
when that is the only source — and otherwise the reason lands on the
attempt row for the missing-subtitles queue.

Closes run as detached tasks because alass and translation outlive the
25 s reconcile action budget; every outcome is recorded in domain rows
first, so a crash converges on the next tick. Failures back off on the
same §6.2 curve as movie searches; a rate-limited provider is the
'capped' queue state; unreachable providers and translators fold into
the existing §9.5 broken notification, edge-triggered.

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

crates/arr-daemon/src/main.rs

@@ -13,6 +13,7 @@ mod reaper;
 pub mod reconcile;
 mod rss;
 mod series_refresh;
+mod subtitles;
 mod tv_grab;
 mod web;
 
@@ -33,6 +34,7 @@ use reaper::ReaperAction;
 use reconcile::{ReconcileLoop, Tick};
 use rss::RssAction;
 use series_refresh::SeriesRefreshAction;
+use subtitles::SubtitleAction;
 use tower_http::trace::TraceLayer;
 use tv_grab::TvGrabAction;
 
@@ -330,6 +332,9 @@ fn reconcile_loop(
         ),
     );
 
+    // §15: subtitle gaps are reconciled from the same rows the API writes.
+    reconcile = reconcile.register(Tick::Reconcile, subtitle_action(config, notifier)?);
+
     // §9.5 *needs a decision* and *broken* both go to the operator alone;
     // without a topic configured there is nowhere to send them.
     if let Some(operator_topic) = &config.ntfy_operator_topic {
@@ -473,6 +478,30 @@ fn jellyfin_client(config: &Config) -> Result<arr_api::jellyfin::JellyfinClient,
     )?)
 }
 
+/// The §15 reconcile lane: closes subtitle gaps from the attempt rows.
+///
+/// Translation backends are passed empty: none is constructed at startup yet
+/// — the compiled-in backends (#191–#193) still need their bootstrap wiring
+/// (model names, base URLs) — so the translate step records "not compiled"
+/// and backs off rather than failing obscurely.
+fn subtitle_action(config: &Config, notifier: &Notifier) -> Result<SubtitleAction, Error> {
+    let action = SubtitleAction::new(
+        subtitle_providers(
+            config.opensubtitles_api_key.clone(),
+            config.opensubtitles_username.clone(),
+            config.opensubtitles_password.clone(),
+        ),
+        Vec::new(),
+        arr_subs::Syncer::new().with_binary(config.alass_path.clone()),
+        arr_probe::Extractor::new().with_binary(config.ffmpeg_path.clone()),
+        jellyfin_client(config)?,
+    );
+    Ok(match &config.ntfy_operator_topic {
+        Some(topic) => action.with_notifier(notifier.clone(), topic.clone()),
+        None => action,
+    })
+}
+
 /// The subtitle providers this deployment can reach (DESIGN.md §15).
 ///
 /// Credentials are bootstrap config and never reach the database (§10), so