Hojun-Cho
a1ee817906
dobuild/dorun/dotest each allocated a 2-byte heap "." prefix buffer via amalloc, set dot[0]='.'; dot[1]=0; passed dot as *u8 to a callee, then let the arena chunk live forever. The dot pointer never escapes the function — every callee chain (resolvemodule, cstrendswithlit, rundirtests/runsingletest) byte-copies its input into a fresh arena allocation before returning, never storing the original pointer. Replace with `let dot: [2]u8 = ['.': u8, 0u8]; ... &dot[0]`. Both stages allocate a fresh frame slot per let at function-frame entry (localoff cstage / localadd wwstage), so the slot lives across the synchronous callee. Verified 132/132 + 995_self_rebuild byte-identity.