[leehack]

Summary

• 0.19.x audit follow-ups (index) #1861 items from the Keep CHANGELOG.md under pub.dev's 256 KiB limit #1883 audit: test that verify_release_docs_versions size-checks each companion's content, and document in pub_content_limits.dart that .pubignore is not consulted.
• .pubignore support skipped on purpose: gitignore syntax is disproportionate for a check no current candidate needs.

Production-readiness scope

• User-facing scope: None; tests and error plumbing only.
• Supported platforms/paths: release tooling
• Unsupported or intentionally unavailable paths: N/A
• Out of scope / follow-ups: Refs #1861 (tick after merge); plan #1874.

Test Plan

• dart format --output=none --set-exit-if-changed and dart analyze on touched dirs
• TMPDIR=$(mktemp -d) dart test -p vm -j 1 test/unit/tooling/pub_content_limits_test.dart (13 pass)
• Full CI: stacked or not on main, run via workflow_dispatch of ci.yml (see comment)

Review Notes

• Mutants: limiting the verifier to the core package fails the three new companion tests

High-risk regression review

• Classification: high-risk (releaseAutomation)
• Implementation task: this PR
• Independent blocking QA task: pending

[leehack]

Landed on main via batch integration PR #1895 (rebase merge, main ba4e0e1b; tree identical to the audited integration head 5ffd1224).

[github-actions]

Chat app preview removed for leehack/llamadart-chat-pr-1889.