docs: reframe README opener around the human+agent audience #91

Job	Run time
Pre-commit	1m 9s
File length	5s
Frontend Build	14s
Version bump check	10s
Frontend Quality	18s
Coverage	22s
Type Check	19s
Commit-type sync	12s
Lint & Format	10s
Branch-protection contexts sync	11s
Aspirational ticket cite	7s
Action pinning audit	5s
Unit tests	24s
Architecture (import-linter)	12s
Tests required	6s
src/ README audit	6s
	4m 10s

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