Finish portable session transfer in Rust

[haasonsaas]

Summary

• exact public mirror of evalops/maestro-internal#2929
• implement portable JSON and JSONL session transfer in Rust, including complete branch-family bundles
• preserve duplicate-ID remapping, parent linkage, and non-reversible nested credential redaction
• delete the superseded TypeScript session-transfer command and behavior harness

Provenance

• internal source PR: https://github.com/evalops/maestro-internal/pull/2929
• the six changed files are byte-identical to the internal squash merge

Staged rollout

Staging is unnecessary: maestro export and maestro import already dispatch directly to Rust. This completes their existing portable-session contract and removes unreachable TypeScript without introducing a new user-visible command.

Verification

• internal Blacksmith CI passed
• 3 focused Rust portable session-transfer tests passed
• Rust nested credential redaction test passed
• all 19 Rust binary routing tests passed
• cargo clippy --bin maestro-tui --lib -- -D warnings passed
• 11 CLI runtime boundary tests passed
• 32 CLI integration tests passed, 22 unrelated tests skipped
• Biome and full bun run build passed
• real CLI JSONL import, secret-redacted JSON export, and duplicate-ID JSON re-import all succeeded

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