fix(gl-flow): shift once for valueless issue-list flags

Fixes #9 (closed). issue-list's --mine and --unassigned are valueless flags but their case arms ran shift 2. Under #!/bin/bash -e this aborts the script when the flag is the last arg (can't shift 2 of 1 positional → rc 1, no output) and otherwise swallows the next argument (--mine --state opened → 'unknown arg: opened'). Changed both to shift (1), matching the adjacent --untracked arm. All other shift 2 arms take a $2 value and are correct. Unblocks the resolver loop, which calls issue-list --mine and issue-list --labels status::ready --unassigned every tick. Verified: both now return rc 0, and --mine --state opened no longer eats the next arg. make validate passes.

Closes #9 (closed)