* docs: changelog catch-up + retrospective blog (agentic development)
Add the headline agentic features that shipped this quarter but were
never logged (agents, plan/delegate, guardrails, workflows, x402) to the
changelog, and add blog #25 — a three-month progress reflection on Go
Micro becoming a framework for agentic development.
* docs: tighten retrospective post — cut slogans, triads, and filler
* docs: tighten retrospective intro, bridge, and conclusion for a single through-line
* docs: frame Go Micro as how you build a distributed system, not run one
---------
Co-authored-by: Claude <noreply@anthropic.com>