perf(highlight): precompute SGR at compile, sorted span claiming, stream ESC-free fast path

- compileRules precomputes the full SGR open sequence per rule and per band;
  wrap() is now pure concatenation, bandOpen() a table lookup (output bytes
  unchanged, bg keeps its unvalidated white-fallback)
- claim() replaces the linear overlaps() scan: claimed spans stay sorted by
  start, O(1) append on the common left-to-right sweep plus one binary search
  otherwise (match-dense 200KB payload: -19% one-shot, -56% streamed)
- HighlightStream: bufferHasEsc flag skips the O(buffer) escape rescans when
  neither the held text nor the chunk contains ESC, fixing quadratic rescan on
  escape-free floods (plain 200KB streamed: -54%)
- applyHighlights tracks the consumed match budget incrementally instead of
  two budgets.reduce() passes per text token
- ESCAPE_RE now covers DCS/APC/PM/SOS (BEL or ST terminated) and single-char
  Fe escapes (DECSC/DECRC/NEL/RI/RIS, orphan ST); isIncompleteEscape holds cut
  tails of the new families; split-smoke exercises every cut point through them

tests/hl-split-smoke.mjs

@@ -7,12 +7,24 @@ import { DEFAULT_HIGHLIGHT_RULES } from '../src/shared/settings.ts'
 
 const rules = compileRules(DEFAULT_HIGHLIGHT_RULES)
 
-// kimi-like: truecolor SGR, OSC title, box drawing, per-line repaints
+// kimi-like: truecolor SGR, OSC title, box drawing, per-line repaints.
+// The tail line exercises the string-terminated families (DCS/sixel, APC/kitty
+// graphics, PM, SOS), a BEL-terminated DCS, and DECSC/DECRC (`\x1b7`/`\x1b8`)
+// so every cut point through them is checked against the reference.
 const banner =
   '\x1b]0;kimi — session\x07' +
   '\x1b[38;2;79;168;255m╭───────╮\x1b[0m\r\n' +
   '\x1b[38;2;136;136;136mWelcome to Kimi Code!\x1b[0m \x1b[38;2;79;168;255m│\x1b[0m send /help\r\n' +
-  '\x1b[38;2;224;224;224mModel: MiniMax-M3 0.41.038 ERROR 99% https://example.com/x\x1b[0m\r\n'
+  '\x1b[38;2;224;224;224mModel: MiniMax-M3 0.41.038 ERROR 99% https://example.com/x\x1b[0m\r\n' +
+  '\x1b7' +
+  '\x1b[38;2;224;224;224mERROR 85% exit code 1\x1b[0m' +
+  '\x1bP0;1;0q#0;2;0;0;0~-..\x1b\\' +
+  '\x1bP1;2|9/9\x07' +
+  '\x1b_Gf=32,s=10,v=10,m=1\x1b\\' +
+  '\x1b^pm-note\x1b\\' +
+  '\x1bXsos-frame\x1b\\' +
+  '\x1b[38;2;136;136;136mdone \u2713\x1b[0m' +
+  '\x1b8\r\n'
 
 const reference = applyHighlights(banner, rules)