Follow-up to #32087 after community report from @ethernet that 8000-char
single-line pastes get dumped raw into the input box.
A) Fallback regression revert
paste_collapse_threshold_fallback default: 0 -> 5
#32087 disabled the fallback handler by default. The fallback path
has been always-on with line_count >= 5 since #3065 (March 2026);
the previous shape was the salvaged contributor's design and didn't
match pre-existing behavior for terminals without bracketed paste
support (Windows terminals, some SSH setups). Restoring the original
on-by-default.
B) Long single-line paste guard
New config key: paste_collapse_char_threshold (default 2000)
Bracketed-paste handler and fallback handler now BOTH collapse when
line count >= line threshold OR total char length >= char threshold.
Catches the case ethernet hit: ~8000 chars of minified JSON / log
output on a single line dumped raw into the buffer.
TUI mirrors the same config via uiStore.pasteCollapseChars.
Set 0 to disable.
Defaults verified:
paste_collapse_threshold: 5
paste_collapse_threshold_fallback: 5
paste_collapse_char_threshold: 2000
Tests:
tests/hermes_cli/test_config.py: 87/87 pass
ui-tui useConfigSync.test.ts: 34/34 pass
ui-tui useComposerState.test.ts: 9/9 pass
tsc: 0 new errors in touched files
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