[codex] Add session-replay evidence for automation

[ScriptedAlchemy]

Summary

• Add bounded recent-session replay evidence alongside keyword grep for session reflector and skill writer automation.
• Add LCM APIs for recent-session selection and head/tail replay slices with summary nodes.
• Surface evidence_mode and replay slices in artifacts while keeping evidence_hash tied to the full evidence payload.

Test Plan

• TMPDIR=/home/zack/.cache/tmp cargo fmt --check
• TMPDIR=/home/zack/.cache/tmp CARGO_INCREMENTAL=0 CARGO_TARGET_DIR=/home/zack/.cache/tracedecay-targets/r4-session-replay cargo check
• TMPDIR=/home/zack/.cache/tmp CARGO_INCREMENTAL=0 CARGO_TARGET_DIR=/home/zack/.cache/tracedecay-targets/r4-session-replay cargo test --test automation_runner_test replay -- --nocapture
• TMPDIR=/home/zack/.cache/tmp CARGO_INCREMENTAL=0 CARGO_TARGET_DIR=/home/zack/.cache/tracedecay-targets/r4-session-replay cargo test --test session_suite lcm_query::recent_sessions -- --nocapture
• TMPDIR=/home/zack/.cache/tmp CARGO_INCREMENTAL=0 CARGO_TARGET_DIR=/home/zack/.cache/tracedecay-targets/r4-session-replay cargo test --test session_suite lcm_query::session_replay -- --nocapture

Note: initial isolated test build attempts using /scratch failed because /scratch was full, so verification was rerun with target and temp directories under /home.

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Latest commit: 31cbfe0

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