adam 8ca1e80603 feat: replace vt100 with wezterm-term for the screen emulator ...

Swap the rendering core. The previous backend (vt100 0.16) only stored
six attributes — fg/bg color, bold, dim, italic, underline, inverse —
and silently dropped everything else when re-emitting the screen. With
modern Claude Code that meant losing OSC 8 hyperlinks, strikethrough,
fancy underline styles, underline color, and so on.

New stack:
  * wezterm-term::Terminal handles the byte-driven VT emulation. Its
    cell model preserves the full modern attribute set including
    hyperlinks and underline color.
  * termwiz::surface::Surface is used as a "mirror of last emitted
    state." Each render diffs the terminal's current visible lines
    against this mirror to compute the minimum change set.
  * termwiz::render::TerminfoRenderer encodes those Changes as bytes
    using a TrueColor + hyperlink-capable capability profile.

A defensive OSC 8 close is appended to every render to handle the case
where the diff ends inside a hyperlinked region (the renderer only
emits the close on transition to a non-hyperlinked cell).

Both termwiz and wezterm-term are pulled from the wezterm git repo at
a pinned rev so the Line types unify across the dep graph.

Test results, against the color-preservation harness from the previous
commit (run via cargo test color_preservation -- --ignored on master):

  baseline (vt100):  0 / 5 passing
  after this commit: 3 / 5 passing  (osc8, strikethrough, double underline)

The two still-ignored tests (curly underline, underline color) are
upstream renderer limitations: termwiz's TerminfoRenderer only emits
Single/Double underline and never emits SGR 58. The cell model stores
both correctly; only the emit step drops them. Tests are kept #[ignore]
with comments calling out the upstream gap.

Total: 118 passed, 4 ignored, 0 failed.

2026-05-01 18:56:29 +00:00

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