chore(pipeline-health): align owner-facing phrasings with CPO spec
Adjust user-facing strings in pipeline_status_message and
morning_briefing.md to match the CPO request verbatim — swap
developer-ish labels ("dream agents didn't run") for owner-facing
framing ("Activity processing gap — meeting notes may be delayed",
"Daily processing hasn't run yet", "N agent error(s) today",
"**Pipeline gap:**"/"**Pipeline issue:**" briefing preambles).
Also ignore tests/fixtures/journal/*/health/*_dream.jsonl — test
runs now produce these via DreamJSONLWriter and they're artifacts,
not sources.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>