build.py: prefer pico/pico2 for rp2040 CI; skill: drop one-time 0.20.0 backfill note

- ci_preferred_boards: rp2040 -> raspberry_pi_pico, raspberry_pi_pico2 so the
  one-board CI/metrics build uses a Pico (the first-alphabetical board failed).
- make-release skill: the metrics backfill was a one-time 0.20.0 task, not a
  recurring release step; keep only the CI auto-compare note.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/build.py b/tools/build.py
index 86bc30d28..fe0d302c8 100755
--- a/tools/build.py
+++ b/tools/build.py
@@ -39,6 +39,7 @@ ci_skip_boards = {
 }
 
 ci_preferred_boards = {
+    'rp2040': ['raspberry_pi_pico', 'raspberry_pi_pico2'],
     'samd2x_l2x': ['metro_m0_express'],
     'samd5x_e5x': ['metro_m4_express'],
     'stm32h7': ['stm32h743eval']