v1.11.0

• Retro eras, off by default. An era is a period look for a specific machine —
  green (IBM 5151), amber, cga (IBM 5153), bbs, c64 — bundling a
  palette, scanlines, a curved-glass vignette, and a typeface. Set [retro] era, pick one in Settings under Retro, or try one for a session with
  pain --era=amber. pain --era=list shows what's available.

  An era overrides your theme while active but never writes to it, so turning
  it off restores what you had. Anything you set explicitly — background
  colour, scanline or vignette strength — still wins over the era.

  Scanlines and the vignette have sliders in Settings, each showing the era's
  value until you move it, with a button to hand control back to the era.

• Eras name period typefaces — VT323 for the phosphor eras, Px437 IBM VGA 8x16 for the DOS ones, C64 Pro Mono for c64 — and use one if it's
  installed. None are bundled; the README says where to get them. The font
  makes more difference to a period look than the palette does, so it's worth
  installing one.

• A drifting hum bar, the soft band that crept up an old monitor when its
  power supply and the mains were slightly out of step. It's the only effect
  that moves, and so the only one that keeps the terminal drawing while idle —
  it stops when the window loses focus, redraws well below your display's
  rate, and hum = 0 turns it off entirely.

• Eras can also be set live by a shell or script, with this terminal's own
  escape sequence:

  printf '\e]7331;era=green\a'

  Session-only and never saved, and the payload is an era name rather than
  colours — so program output can't leave you with an unreadable screen.

• The scanline and vignette effects are static: they add one draw to a frame
  that was already being rendered, so with the hum bar off an idle terminal
  still renders nothing and still sleeps.