YuKu tests on the bare Linux VT (not a terminal emulator): my 16-colour
fallback alternated blue (44) / bright blue (104), which render nearly
identically on VGA consoles -> fused into 'solid blue'. If TERM
misreports 256, 48;5;N codes are ignored outright.
Fixes:
- TERM linux*/console* forces the 16-colour path regardless of tput.
- 16-colour mode now PULSES THE BLOCK ON/OFF (2 frames blue block,
2 frames no block, ~2.5Hz) instead of shade alternation — visible
on any console hardware, no colour fidelity required.
- 256-colour terminals keep the deep 17->45 breathe ramp.
Verified: TERM=linux pty shows block/no-block alternation with zero
48;5 codes; TERM=xterm-256color keeps the 8-shade ramp; unattended +
piped regressions green.
Pathfinder
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