Validate the design against the live servers, and correct it

Ran the probe and a new reclaim preview against Loki and Tautulli from a LAN
host. The measured library is 65.7 TB across 24 libraries with 60 users and
87,640 logged plays. Five things in the design were wrong or missing.

- Tautulli's get_library_media_info returns file_size 0 for every show
  section regardless of section_type, so it cannot cross-check TV sizes.
  Plex is the only size authority for TV, which is 49 of the 66 TB.
- solitude: divisor of 3 confirmed correct (61.7% of watched items have
  exactly one viewer), but weight raised 0.04 -> 0.10 since on a 60-user
  server "only one person watched this" is real signal.
- rejection: abandonment is 4.9% of plays, not the 30% hoped for. Weight
  cut 0.12 -> 0.06. Kept because it is decisive when it fires.
- Cross-library duplicates promoted from "later candidate" to v1: with 16
  movie sections, Movies and 4K Movies routinely hold the same film.
- Protected libraries added. Family Videos is 38 GB of irreplaceable home
  video that is 86% "never played" and scores as a perfect delete target.

Also splits the reclaim pool into confident (6.5 TB, added while Tautulli
was watching and never played) and uncertain (20.9 TB, predates coverage).
80% of the library predates Tautulli, so pre_history is the majority state,
not an edge case.

Adds tools/reclaim_preview.py, which produced these numbers.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GVbG48GAXfCZatcmX123Ra

README.md

@@ -17,7 +17,10 @@ a ranked list, saved rule sets, and CSV export. Deletion is designed for in the
 but deliberately not built, so the scanner and the scoring model can be trusted before
 anything destructive is wired up.
 
-Nothing is implemented yet — this repository currently holds the design.
+Nothing is implemented yet — this repository holds the design plus the read-only tools
+used to validate it. The design has been checked against the live servers: 65.7 TB across
+24 libraries, 2,930 movies and 2,807 TV seasons, 87,640 logged plays from 60 users, and
+27.4 TB never played. See `docs/design.md` §2.1.
 
 ## What it does
 
@@ -58,10 +61,17 @@ export PLEX_TOKEN=...
 export TAUTULLI_BASE_URL=http://192.168.1.100:8181
 export TAUTULLI_API_KEY=...
 
-python3 tools/probe.py                        # summary to stdout
+python3 tools/probe.py                        # library shapes, sizes, coverage horizon
 python3 tools/probe.py --dump inventory.json  # plus a full item inventory
+python3 tools/reclaim_preview.py              # the actual reclaim numbers
 ```
 
+`reclaim_preview.py` joins Plex sizes to Tautulli plays the way the application will, and
+reports never-played bytes per library — split into the *confident* pool (added while
+Tautulli was watching, never played) and the *uncertain* pool (predates Tautulli, might
+have been watched). It also prints the largest never-played TV seasons and the
+watcher-count distribution used to calibrate the score.
+
 It reports Tautulli's coverage horizon, the finished/abandoned/never-opened split across
 real plays, library shapes and sizes, path roots, multi-version items, and whether
 Tautulli is actually watching the Plex server you think it is. Credentials are redacted
@@ -71,4 +81,5 @@ from all output including error messages, so the result is safe to paste anywher
 
 - [`docs/design.md`](docs/design.md) — the full software design
 - [`tools/probe.py`](tools/probe.py) — read-only reconnaissance script
+- [`tools/reclaim_preview.py`](tools/reclaim_preview.py) — read-only reclaim numbers
 - [`tools/mockserver.py`](tools/mockserver.py) — mock Plex/Tautulli for testing the probe