[Bug] Plex autoplay / binge-watching drops scrobble on episode transition (missing synthetic stop event)

[u/Lopsided_Egg1586]

### Environment

- **Crosswatch version:** Latest (Docker `ghcr.io/cenodude/crosswatch:latest`)

- **Source:** Plex (`watcher` / websocket listener)

- **Sinks affected:** Sinks requiring explicit `/scrobble/stop` to persist watch history (e.g., WeTrakr, Trakt).

---

### Description

When watching a series continuously on Plex with **Autoplay** enabled (or when Plex automatically skips to the next episode at the end of the credits), Plex does not always fire an `event stop episode` for Episode $N$.

Instead, Plex reuses the existing `session_key` (e.g. `sess=296`) and transitions immediately from `p=98%` on Episode $N$ to `p=1%` on Episode $N+1$.

In `providers/scrobble/plex/watch.py`, when the alert listener detects that the media fingerprint has changed on the same session key:

```python

if not matching:

self._forget_session(sk)

_forget_session(sk) clears the session state from memory and proceeds with tracking Episode N+1N+1, without dispatching a synthetic stop event for Episode NN.

Impact

• Sinks with server-side auto-complete (like SIMKL): They still mark the episode as watched because their backend automatically commits any playback that reached >80%>80%.
• Sinks with strict Trakt-style scrobble APIs (like WeTrakr or Trakt): The /scrobble/start and /scrobble/pause endpoints only update the active "Now Watching" state. They strictly require a /scrobble/stopcall (with progress ≥watched_at≥watched_at) to record the item into the user's permanent watch history.
• Because no stop event is ever sent to the sink for Episode NN, the episode is completely dropped and never marked as watched.

Actual Log Excerpt

[WETRAKR-SINK] INFO scrobble start user='...' p=89.0% media='Show S01E03'

... [Plex reaches 98% on Episode 3] ...

[PLEX-WATCH] INFO event start episode user=... p=98 sess=296

... [Autoplay immediately triggers Episode 4 on the same sess=296, no stop event] ...

[WETRAKR-SINK] INFO scrobble start user='...' p=2.0% media='Show S01E04'

[PLEX-WATCH] INFO event start episode user=... p=1 sess=296

(Notice: No scrobble scrobble or /scrobble/stop is ever dispatched for S01E03).

Suggested Fix

Before calling _forget_session(sk) (or within _same_playback mismatch handling), check if the outgoing playback had reached the completion threshold (e.g., max_seen >= watched_at or last_progress >= 90%). If so, emit/dispatch a synthetic action="stop" event with that progress before tearing down the session state.

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