Tighten v1 action input validation

[taro-28]

Summary

• validate with-disable so only true / false are accepted
• reject from unless environment-id is set, and reject matching source/target environment IDs
• align README and action.yml input descriptions for v1.0.0 publication

Behavior

workflow input
  -> scripts/run.sh validates contract
  -> valid inputs call bm sync
  -> invalid combinations fail before CLI execution

Validation

• bats tests/
• shellcheck -x scripts/*.sh tests/fixtures/bm-mock
• git diff --check HEAD~1 HEAD
• conflict marker scan for changed files

Release Notes

After this PR merges, create and push v1.0.0; the existing Release workflow will create the GitHub Release and update floating tag v1.

[github-actions]

mock sync output

[github-actions]

mock sync output

[github-actions]

mock sync output

[github-actions]

mock sync output