docs: document Jira Markdown comment memory-growth workaround

[SourceCode]

Summary

An indented Markdown pipe table under a list item can make TWG CLI 1.3.5 hang and consume unbounded memory before posting a Jira comment. Document the verified workaround: end the list and put the table and following paragraph at column zero.

Adds a sanitized reproducer, bounded measurements, implementation regression requirements, and a troubleshooting link from SUPPORT.md.

Related to #25. This documentation PR does not patch the executable or close the issue; the implementation source is absent from this public repository.

Public Safety Checklist

• No tokens, credentials, cookies, auth files, or .env files.
• No private Jira, Confluence, Bitbucket, infrastructure, pipeline, or customer URLs.
• No customer data, proprietary content, or internal runbook detail.
• No generated artifacts or plugin/release metadata changed.

Verification

• Installed TWG CLI 1.3.5, macOS arm64: sanitized indented input exceeded the 512 MiB watchdog threshold in 1.41 seconds; the dedented variant reached the expected HTTP 404 in 0.65 seconds.
• Used deliberately nonexistent numeric issue ID 0, so no comment was posted and no Jira issue changed.
• Reporter-provided original input reproduced the same behavior in a separate bounded check.
• Offline dedented conversion preserved one table, all nine data cells, and all three list items.
• Issue-template YAML validation, required-file checks, and git diff --check pass.
• Changed files pass public-safety scans. The repository-wide sensitive-pattern scan flags two pre-existing auth.conf references in the benchmark runner; this PR does not alter them.

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