Add ecosystem file for pm2

Editor assessment

The header itself is solid: `feat` correctly flags a new ecosystem file, and 'add ecosystem file for pm2' is imperative, lowercase, and short. Everything below the blank line, however, is raw squash residue. The CRLF line endings, the repeated 'Co-authored-by' trailer (listed twice), and the bullet list of intermediate commits ('fix: stop hardcoding DEBUG') read like an unedited git log rather than a description of why the file is needed. Trailers should be canonical `token: value` lines grouped at the end, not duplicated mid-text. A one-line motivation would serve better.