Add ANSI.replay to collapse captured repaints

[GoodForOneFare]

tl;dr - add ANSI.replay that removes noise from log files piped from cli-ui output.

Spinners and progress bars repaint by moving the cursor, so a capture of the stream (a log file, StdoutRouter's duplicate output, test output) holds one frame per tick. ANSI.strip_codes deletes those control sequences instead of applying them, which leaves every frame side by side rather than overwriting: \r disappears, and CSI_SEQUENCE matches neither the parameterless (\e[K) nor the private (\e[?25l) forms, so those survive as text.

ANSI.replay applies the stream's viewport-independent controls -- CR/LF/BS, relative cursor moves, erase-line, insert/delete-line, cursor save/restore -- to a line grid and returns the text the repaints settled on. Presentation sequences and control-string payloads (OSC, DCS) are dropped, as a terminal drops them, and so are operations that assume a viewport (absolute positioning, display erasure): a capture does not record scrolling, so a screen coordinate has no buffer row to map onto. Shopify's dev CLI attaches its dev up log to error reports, where a 450KB capture replays to 41KB of what the developer actually saw.

There is no viewport: a capture has no scrollback to lose, so height is unbounded and cursor moves, gap padding and insert-line are capped instead. Only rows a control sequence conjures count against that cap, so an ordinary long capture never exhausts it.

[GoodForOneFare]

This stack was inverted so replay could ship first. GitHub marked this PR merged when its rewritten head became an ancestor of the former base; no replay commits merged to main here. The standalone replacement is #625, with #624 now stacked above it.