@codex review

@codex please provide a summary of this PR in ## Summary and ## Details

Summary

• Introduces a CuDebugSession API that indexes copperlist sections and keyframes, caches decoded sections, and provides jump/step operations (goto_cl, goto_time, step) to replay deterministic runtime state from logs. core/cu29_runtime/src/debug.rsL1-L469
• Expands the cu_debug_session example to record multi-section logs, build replay callbacks, and exercise index-based/time-based jumps with assertions on runtime state during replay. examples/cu_debug_session/src/main.rsL1-L349
• Adjusts the debug session example configuration to use a short keyframe interval for time-travel demonstrations. examples/cu_debug_session/copperconfig.ronL1-L36

Details

• The debugger index is built in a single streaming pass across unified log sections, capturing section boundaries, culist IDs, timestamps, and keyframes, with defensive handling for missing timestamps and empty sections. core/cu29_runtime/src/debug.rsL511-L656
• Jump logic restores the nearest keyframe when rewinding, replays copperlists to the target, and reports replay metadata via JumpOutcome, while find_section_for_* helpers locate sections by index, culist ID, or time ranges. core/cu29_runtime/src/debug.rsL220-L447
• The example demonstrates a full time-travel workflow: generating logs, building custom sim callbacks that replay recorded outputs, and validating task state at specific copperlists and timestamps across the log’s end-to-end traversal. examples/cu_debug_session/src/main.rsL141-L349

Commands reviewed: git log --oneline --decorate --graph --all -n 20, git show --stat 4a6ad40..HEAD, rg -n "" core/cu29_runtime/src/debug.rs examples/cu_debug_session/src/main.rs examples/cu_debug_session/copperconfig.ron examples/cu_debug_session/Cargo.toml, nl -ba core/cu29_runtime/src/debug.rs | sed -n '1,760p', nl -ba examples/cu_debug_session/src/main.rs | sed -n '1,520p', nl -ba examples/cu_debug_session/copperconfig.ron.

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