Add CustomRecoveryPassphraseRequirements to ElementWellKnown and decode
the custom_recovery_passphrase_settings block (currently just
min_character_count) from the homeserver's element.json. Invalid specs
(missing or non-positive min_character_count) are logged and mapped to
null so the setup flow falls back to the generated-key path. Field names
match the ESS well-known schema (element-enterprise#261).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jenna Vassar
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