Add a `boom` subcommand that generates the `💥` section of CHANGES.md
from the closed, non-excluded milestone issues labelled `breaking change`,
using the last `## Breaking change note` comment of each issue. The whole
comment is copied (headings demoted to `#####` outside code fences), and
each issue becomes a `#### <title>` block with the issue and merged
closing PR references on their own line. `--write` replaces only that
subsection and is idempotent.
Add a `comments` subcommand to gh.py (REST, paginated) so the generator can
read issue comments, and report anomaly type G (`breaking change` issue
missing from `💥`), mirroring the `release highlight` check.
Document the flow in `mem:workflow/updating-changelog` (also readable by
release managers, like `mem:audit-log`), turn the `update-changelog` skill
into a router to it, and update the references in `critical-info`,
`creating-issues` and the scripts memories.
AI-assisted-by: deepseek-v4.1-flash
