Regenerate only native V3 Session/output oracles through the shipped headless and SDK profiles. These outputs retain system-message admission before users, bind request metadata before title fallback, and record real V3 delivery acknowledgments. Historical V0/V1/V2 replay inputs remain unchanged; pinned scenarios keep separate writer outputs.
The upper headless/SDK refresh covered109 cases; the only initial failure used macOS system Python3.9 for the PTC Python scenario, which passed with the declared CPython3.14 PATH. No assertion or runtime behavior was changed to accommodate it.
Retained V0/V1 fixtures remain replay inputs while writer.expected JSONL records the actual current V3 output. Record these through the shipped headless scenarios rather than reverse-normalizing system messages back into historical headers. Preserve generation-qualified reference provenance, and correct the unreleased PowerShell seed to start its step and protected system head before user surface input.
Validation: the structural migration, real persistence, corpus and snapshot-support gate passed616 tests with one intentional skip; all91 headless refresh cases pass after the audited assistant-attempt source handling. Every predecessor path remains restored to the shared V3 base, and generated changes are confined to V3/output oracles and current tool schema pins.
Dudu-0223