docs(common): list espn_payload in the common README

#749 added src/common/espn_payload.py without a summary row or section,
so test_common_readme_lists_every_module fails on main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VZNWFWprcFYGfuf1JAyrBJ
(cherry picked from commit 8333f23e5c)

first_time_install.sh

@@ -91,11 +91,16 @@ if [ -r "$LM_OS_RELEASE_FILE" ]; then
     DESKTOP_DETECTED=0
     # grep without -q: -q exits at the first match, dpkg then dies of SIGPIPE,
     # and pipefail turns a found desktop into "not found".
-    # Match installed package names from their start: the unanchored ".*kde"
-    # matched mid-word (libblockdev-* = "bloc-kde-v") on Lite, and `dpkg -l`
-    # lines also carry descriptions that could match.
+    # Desktop metapackages and session managers, matched as whole installed
+    # package names: an unanchored ".*kde" matched libblockdev-* ("bloc-kde-v"),
+    # and a "gnome" prefix matched standalone parts such as gnome-keyring.
+    # Trixie replaced raspberrypi-ui-mods with the rpd-*-core metapackages.
+    DESKTOP_PACKAGES='raspberrypi-ui-mods|rpd-wayland-core|rpd-x-core'
+    DESKTOP_PACKAGES+='|lxde|lxde-core|lxsession|xfce4|xfce4-session'
+    DESKTOP_PACKAGES+='|gnome-shell|gnome-session|kde-plasma-desktop|plasma-desktop'
+    DESKTOP_PACKAGES+='|plasma-workspace|task-desktop|task-[a-z0-9]+-desktop'
     if dpkg-query -W -f='${db:Status-Abbrev} ${binary:Package}\n' 2>/dev/null \
-            | grep -E "^ii +(raspberrypi-ui-mods|lxde|xfce|gnome|kde)" >/dev/null; then
+            | grep -E "^ii +(${DESKTOP_PACKAGES})(:[a-z0-9]+)?$" >/dev/null; then
         DESKTOP_DETECTED=1
     fi
     if systemctl list-units --type=service --state=running 2>/dev/null | grep -qE "lightdm|gdm3|sddm|lxdm"; then

src/common/README.md

@@ -28,6 +28,7 @@ Rules for the package:
 | [`api_helper`](#api_helper) | HTTP GET/POST with caching and rate limiting | Yes | — |
 | [`bdf_font`](#bdf_font) | Load and draw BDF bitmap fonts | Yes, if drawing BDF text directly | 3.5.0 |
 | [`espn_dates`](#espn_dates) | Fetch ESPN scoreboards across a date range | Yes (scoreboards) | 3.5.0 |
+| [`espn_payload`](#espn_payload) | Drop the parts of an ESPN scoreboard payload no scoreboard reads | No, core-internal (used by `BackgroundDataService`) | n/a |
 | [`favorite_team_check`](#favorite_team_check) | Log why a favourite team code shows nothing | Yes (scoreboards) | 3.6.0 |
 | [`fetch_service`](#fetch_service) | Pooled, merged, budgeted and counted HTTP for core fetch paths | No, core-internal (reached through `api_helper` and `espn_dates`) | n/a |
 | [`font_layout`](#font_layout) | Reproducible TrueType loading, crisp sizes | Yes | 3.4.0 |
@@ -120,6 +121,18 @@ Every request goes through [`fetch_service`](#fetch_service), the chunks
 counted against the plugin that asked. Scoreboard plugins also bundle a copy
 for older cores.
 
+### espn_payload
+
+[`espn_payload.py`](espn_payload.py). Core-internal. ESPN scoreboard
+responses carry stat leaders, athlete cards, links, headlines and highlights
+that no scoreboard draws. `slim_scoreboard_payload(payload)` removes exactly
+those keys, in place, and leaves everything it does not know about alone;
+`is_espn_scoreboard_url(url)` says whether a URL is an ESPN site-API
+scoreboard. `BackgroundDataService` slims each scoreboard window before
+caching it, which cuts the five sports windows from ~40MB to ~12MB of parsed
+objects. Adding a key to the drop lists means first checking that nothing
+reads it.
+
 ### favorite_team_check
 
 [`favorite_team_check.py`](favorite_team_check.py).