docs: add observability-designer to README, CHANGELOG, and skills index

Completes the 6 POWERFUL-tier skill documentation update.
Skill count: 59.
This commit is contained in:
Leo
2026-02-16 14:08:06 +00:00
parent 907faa1720
commit b7e09026b0
16 changed files with 6829 additions and 3 deletions

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