phase 1: cleanup, REPL polish, README
- fix format-string in jprint/script_print (printf(msg) -> fputs)
- fix bsexp_deinit: deinit_script guarded by sctx, not jc
- silence "config.script not found" when the optional override is absent
- remove dead code: bs/cmds/, bs/args.{c,h}, bs/utils.h, commented blocks
- REPL: welcome banner with version, readline tab-completion on
script_commands_list, skip blank lines, clean Ctrl-D exit
- README: build, REPL usage, typical SPI flow, command table, probes,
Xilinx STARTUPE3/CCLK caveat
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
francois
7cb3627754