Markdown convention: bless trailing-backslash hard line breaks

[ptr727]

The AGENTS.md "Documentation Style -> Markdown" rule says "One logical paragraph per line; no hard-wrap line-length limit." GitHub Copilot's PR review reads this as forbidding trailing-backslash (\) hard line breaks and repeatedly flags them on README badge / status / license blocks (stacked one-per-line entries that use \ or trailing whitespace as <br>).

These hard breaks are intentional and read better than invisible trailing-double-spaces, and they aren't paragraph wrapping. The current wording causes avoidable review friction every round.

Suggestion

Clarify the rule to explicitly allow \ for intentional hard line breaks within a block, preferred over trailing whitespace. Wording used downstream:

One logical paragraph per line; no hard-wrap line-length limit. For an intentional hard line break within a block - stacked badges, status, or license lines - end the line with a trailing backslash (\); this explicit form is preferred over trailing whitespace for readability and is not treated as a paragraph split.

This keeps the no-hard-wrap intent while stopping the false-positive review flags.

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Surfaced in ptr727/ESPHome-NonRoot (see ptr727/ESPHome-NonRoot#63); applied downstream already.

[ptr727]

Blessed intentional trailing-backslash hard line breaks (preferred over trailing whitespace) in the AGENTS.md Markdown rule.

Addressed in #167 (merged to develop; not yet promoted to main, pending any further feedback as these changes are applied downstream).