feat(media): a TV mover that will not file a show the library already has

Two fixes found by one live sweep, shipped together because the second is
what makes the first finishable.

1. scripts/media-tv.py — the other half of media-plan.py's refusal to file
   TV. Groups episode-shaped files by the series name before the marker
   (media-titles.ep_of, imported not restated), writes a plan in the
   executor's own format: <library>/<Series> (<year>)/Season <NN>/<own
   name>.<ext>. Refuses a group below --min, an episode naming no season,
   and an episode the destination library already holds at the same byte
   count — the movie share carries a second copy of all 124 Monk episodes
   the TV library has had for years; a duplicate is Frank's call, never a
   tool's copy. Applied by media-apply.py with its own journal and
   --root /mnt/entropy.

2. scripts/media-apply.py — gone meant "rmdir intended", so a folder whose
   rmdir failed was blacklisted forever and no later sweep could finish it
   (live movie sweep: 4517 targeted, 146 permanently stranded). gone now
   means "actually gone": a failed intent is retried by the next sweep.

tests: 9 new tests in media_relayout.bats, each red against the previous
revision — 8 TV + 1 sweep retry behind a chmod 500 parent. ./tests/run.sh
633 green. No live move run yet.

scripts/media-apply.py

@@ -249,7 +249,11 @@ def sweep_targets(root, journal):
     """
     moves = [r for r in journal.records if r.get("op") == "move"]
     made = {r["dst"] for r in journal.records if r.get("op") == "mkdir"}
-    gone = {r["path"] for r in journal.records if r.get("op") == "rmdir"}
+    # An rmdir INTENT that failed left its folder standing, and the next sweep
+    # must be able to finish it: only a folder that is really gone is out of
+    # scope. Counting every intent as done made 146 live survivors permanent.
+    gone = {r["path"] for r in journal.records if r.get("op") == "rmdir"
+            and not os.path.exists(r["path"])}
     dsts = [r["dst"] for r in moves]
     marked = set()
     for r in moves: