docs: identifier durability — recorded cases and the machine-readable remedy

[damienriehl]

Adds an Identifier durability section to docs/schema.md plus a new open question, and fixes the README's scheme example to match docs/schema.md and the data (the old martyrologium_romanum_cei_2004 example exists nowhere in the registry — that recorded contradiction is itself one of the section's cases).

No existing identifier is changed, deprecated, or renamed by this PR. All argument lives in the position paper — this PR only demonstrates this repository's recorded cases and the remedied form: CatholicOS/foundation-docs#58 (discussion: CatholicOS/foundation-docs#57).

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https://claude.ai/code/session_01MoZuH8vKiwL2rsX3a1zSqc

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