Add performance benchmark suite comparing ghostel, vterm, and eat

Benchmarks terminal emulator performance across four tiers:
- PTY benchmark: real process pipe with filter + timer redraw loop
- Streaming: chunked writes with periodic redraws
- TUI frames: full-screen rewrite fps
- Engine micro-benchmarks: isolated parse/render cost

Includes ghostel variants for incremental/full redraw and with/without
URL/file detection, plus a URL-heavy data generator to measure
detection overhead. Run via `make bench` or `make bench-quick`.

Author: dakra

Makefile

@@ -3,7 +3,7 @@ EMACS ?= emacs
 XDG_CACHE_HOME ?= $(HOME)/.cache
 MELPAZOID_DIR  ?= $(XDG_CACHE_HOME)/melpazoid
 
-.PHONY: all build check test lint melpazoid byte-compile clean
+.PHONY: all build check test lint melpazoid byte-compile bench bench-quick clean
 
 all: build test lint
 
@@ -29,6 +29,12 @@ melpazoid:
 byte-compile:
 	$(EMACS) --batch -Q -L . -f batch-byte-compile ghostel.el ghostel-debug.el
 
+bench:
+	bash bench/run-bench.sh
+
+bench-quick:
+	bash bench/run-bench.sh --quick
+
 clean:
 	rm -f ghostel-module.dylib ghostel-module.so
 	rm -f ghostel.elc ghostel-debug.elc