docs(ops): add session snapshot for 2026-04-15
- Resolved 7 Pylance errors in identity shard (async/to_thread misuse, missing AD adapter methods)
- Remapped search_users, get_stale_accounts, get_disabled_accounts, get_user_by_email call sites
- Added structured logging to identity shard
- Verified 0 diagnostics and 19/19 unit tests passing
- Live mock validation: status reconciliation, disabled accounts, audit log queries
- Deferred: WIS-018 (get_groups backend method), field-name alignment audit
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