chore(changeset): name only the two prototype keys the old lookup crashed on

Claude-Session: https://claude.ai/code/session_01DhTqaEHqPVSVnAkjG3jywn
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

.changeset/22161-rule-message-one-line.md

@@ -17,6 +17,6 @@ Clause-②: yes (widening)
 
   The finding's `message` no longer restates its `where`, and no longer carries the list of consumer and carrier kinds, the exemptions or the scanned roots; `hint` is the fix alone (for a `carrier-only` verdict it still names each carrier site a removal must clean). The `verdict`, `carriers` and `rootsScanned` fields of a `field-no-consumers` finding are unchanged. A tool that matched the old message text should match on `rule`, `where` and `path` instead.
 - **`os explain <rule-id>`.** `os explain` takes an author-time rule id as well as a schema name — `os explain field-no-consumers`, `os explain security-owd-unset` — and prints the reasoning the warning no longer carries; `--json` prints `{ rule, covers, paragraphs }`. A schema name resolves exactly as before. With no argument it also lists the rule ids that have an explanation (`--json` adds `rules: [{ id, covers }]`). The `rule:` line names the command only for those rule ids.
-- **`os explain constructor` (or `__proto__`, `toString`) is refused as an unknown id** instead of printing `Schema: Object … undefined` and crashing with `schema.required is not iterable`: both lookups read own keys only.
+- **`os explain constructor` (or `__proto__`) is refused as an unknown id** instead of printing `Schema: Object … undefined` and crashing with `schema.required is not iterable`: both lookups read own keys only.
 - **`os validate` prints the `fix:` and `rule:` lines** under each author-time warning, the way `os build` does, and the hint line under every author-time finding (`os build`, `os validate`, `os verify`, `os init`) is now labelled `fix:`. `os lint` adds the same `os explain` pointer to its rule line.
 - **New exports in `@objectstack/lint`:** `RULE_EXPLANATIONS`, `explainRule(ruleId)` and the type `RuleExplanation`, from the root entry and from the import-free `@objectstack/lint/rule-explanations` entry.