ChatGPT can require signing in, and it does not always send a prefilled
prompt. The README and options panel mentioned pressing Enter only in
passing. Give both a prominent note covering sign-in and Enter or Send,
and drop the inline mentions it replaces.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
maxlength was hard-coded to 200 in the markup while MAX_MODEL_CHARS lives
in lib/defaults.js; lowering the constant would have left the input
accepting values mergeSettings() silently discards. It is now set from the
constant at render time.
Also records the hasFocus() gate's four manual frame cases in AGENTS.md,
including the findbar trade-off, and notes that fitToBudget()'s budget
guarantee assumes mergeSettings-validated input.
