Update project issues: resolve #02-#04, add #08-#10

Mark issues #02 (backtick lexing/parsing), #03 (command execution
runtime), and #04 (argv parsing) as resolved. Add new issues for
configuration (#08), programmable prompt (#09), and interactive
command execution (#10).

issues/04-argv-parsing.md

@@ -1,6 +1,6 @@
 # 04 — Implement argv parsing (tokenize command strings)
 
-**Status:** open
+**Status:** resolved
 **Blocked by:** #01
 **Blocks:** #06