status board: R-vs-mag panel consolidated in; m-bias rerun note (2026-07-04)

Move Fabian's star metacal shear-response R1-vs-magnitude panel (45,835 stars)
into the main status page's star-response section, with the benign-for-shear
framing (bright-end climb is the point-source T->0 floor; resolved galaxies
hold the flat symmetric-response regime). Add a dated m-bias note: the
image-sims chain is being rebuilt on one consistent post-#761 new-grammar
container vintage with raw-input staging fixed; m2~=-0.80 flagged as a
stale-input plumbing smoke, not a calibration result (ideal m=-2e-3,
guardrail |m|<5e-3).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013uTmBAtdP5Wvav2M76MgCA

Author: cailmdaley