tenferro: align public AD surface with linearize-first tidu

[shinaoka]

Summary

• depends on tidu: switch to a linearize-first value-centered autograd surface tidu-rs#11 and assumes the new value-centered, linearize-first AD API
• hard-cut tenferro onto the new internal AD surface and expose public Tensor reverse-mode plus jvp(...) on top of linearized JVP/VJP seams
• align linalg public contracts and oracle replay coverage for solve_triangular, lu, lstsq, eig/eigh, norm, and related complex-aware paths
• refresh docs, support matrices, and integration tests to match the current public surface and remaining oracle gaps

Test Plan

• cargo test -p tenferro --test integration --release -- --nocapture
• cargo test -p tenferro-linalg --release oracle_db_replay_against_tensor_ad_oracles -- --nocapture
• cargo test -p tenferro-linalg --release oracle_db_support_report_matches_checked_in_markdown -- --nocapture
• cargo test -p tenferro --doc --release
• cargo check -p tenferro --tests --release