Add repository verification workflow

[memotype]

Summary

• add a single verify.sh entry point, exposed as make verify, for Bash/Ruby syntax checks, executable-mode checks, direct bj.sh CLI smoke tests, generated-file freshness, wrapping constraints, and the functional suite under both the default locale and LC_ALL=C
• add GitHub Actions CI that force-regenerates the compact scripts, runs the verification suite, and fails if regeneration changes tracked output
• add the verification workflow badge to the top of the README

The direct CLI coverage checks argument and stdin queries as well as exact status 1 with empty output for a missing key. Generated files are rebuilt only in a temporary directory during verification, so make verify itself does not mutate the worktree.

Validation

• make verify
• make -B all
• git diff --exit-code after forced regeneration
• GitHub Actions Verify workflow passing on the branch