Preserve session-list consumers from depending on encoded session IDs by carrying persisted creation timestamps through managed summaries and JSON detail output, with an ID timestamp fallback only for legacy metadata that lacks created_at_ms.\n\nConstraint: ROADMAP #335 requires created_at_ms in session_details with the same millisecond unit as updated_at_ms.\nRejected: Making callers parse session IDs | undocumented ID structure is brittle and was the issue being fixed.\nRejected: Session storage redesign | scope is limited to detail metadata propagation and legacy compatibility.\nConfidence: high\nScope-risk: narrow\nDirective: Keep ID timestamp parsing fallback-only; persisted session_meta.created_at_ms remains the source of truth when present.\nTested: cargo fmt --manifest-path rust/Cargo.toml --all -- --check; cargo check --manifest-path rust/Cargo.toml --workspace; cargo build --manifest-path rust/Cargo.toml --workspace; cargo test --manifest-path rust/Cargo.toml --workspace; cargo clippy --manifest-path rust/Cargo.toml -p runtime -p rusty-claude-cli --all-targets\nNot-tested: live interactive /session list against a real provider-backed REPL
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