docs(v4): 4.0 design spec + CI-enforced deprecation ledger (Phase 1) #3050

Job	Run time
Rust Unit Tests (ubuntu-latest)	1m 19s
Pure Python Fallback	1h 20m 57s
Rust Unit Tests (macos-latest)	1m 18s
Rust Unit Tests (ubuntu-24.04-arm)	1m 21s
Python Tests (ubuntu-latest, py3.14)	1h 1m 0s
Rust Unit Tests (windows-latest)	2m 13s
Python Tests (ubuntu-latest, py3.13)	1h 4m 29s
Python Tests (ubuntu-latest, py3.11)	56m 12s
Python Tests (macos-latest, py3.13)	32m 49s
Python Tests (ubuntu-24.04-arm, py3.14)	32m 46s
Python Tests (windows-latest, py3.14)	55m 21s
Python Tests (ubuntu-24.04-arm, py3.11)	34m 5s
Python Tests (ubuntu-24.04-arm, py3.13)	32m 57s
Python Tests (macos-latest, py3.11)	33m 32s
Python Tests (macos-latest, py3.14)	31m 37s
Python Tests (windows-latest, py3.13)	1h 0m 25s
Python Tests (windows-latest, py3.11)	59m 31s
	10h 41m 52s

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