Test selection map

Use Tier 1 first for a fast subsystem verdict, then the focused suite for the area you changed.

Changed paths	First run	Focused follow-up
lang/cpp/**, test/pp/**	make test-t1-pp	make test-pp
lang/c/**, test/parse/**	make test-t1-c-front	make test-parse
src/cg/**, include/kit.h, lang/toy/**	make test-t1-cg	make test-cg-api test-toy
src/opt/**	make test-t1-opt	make test-opt
src/arch/**	make test-t1-arch test-t1-asm-disas	make test-isa test-asm plus the touched arch inline target
src/asm/**, driver/cmd/as.c, driver/cmd/disas.c	make test-t1-asm-disas	make test-asm
src/obj/**, object format readers/writers	make test-t1-obj	make test-elf test-macho test-coff
src/link/**, JIT image mapping	make test-t1-link-jit	make test-link
cross hosted profiles, sysroot resolution, target triples	make test-t1-cross	make test-cross TARGET=<selector> DEPTH=smoke
rt/**	make test-t1-rt	make test-rt-runtime test-rt-backtrace
src/debug/**, src/dbg/**	make test-t1-debug	make test-debug test-dwarf test-dbg
src/emu/**, src/interp/**	make test-t1-emu-interp	make test-emu test-emu-unit test-interp
lang/wasm/**, src/arch/wasm/**	make test-t1-wasm	make test-wasm test-wasm-target
driver/cmd/**, byte utility tools	make test-t1-tools	make test-driver-help plus the matching test-driver-* target
src/dist/**, src/api/cas.c, src/api/package.c	make test-t1-dist	make test-dist test-selfdist
src/gram/**, driver/cmd/gram.c, test/gram/**	make test-t1-gram	make test-gram test-driver-gram
test/lib/**, mk/test.mk	make test-t1-harness test-tier1	affected suite
Makefile, mk/**, public headers	make test-t1-build test-tier1	affected suite