bug(repl): imports/importers commands don't support inline flags

[rocketman-code]

Current Behavior

The imports and importers REPL commands use require_arg instead of parse_flags, so they do not support inline flags like --json, --include-dynamic, etc.

Expected Behavior

The imports and importers commands should be routed through parse_flags like other commands (trace, chain, cut, packages) so they support the same inline flag syntax.

Context

Inconsistent flag support across REPL commands is confusing for users.

Technical Details

Relevant Code

src/repl.rs — Command::parse

The imports and importers arms call require_arg(arg, ...) directly instead of parse_flags(&tokens).