[runx] refresh thread teaching

[auscaster]

Summary

This draft PR refreshes state/thread-teaching.json from trusted GitHub issue and PR teaching records.

• source evidence stays in the underlying issue and PR threads
• the state file is a rebuildable cache for runtime context and training
• merge remains human-reviewed

Generated PR Policy

• Generated by lane: thread-teaching-derive
• Publication mode: draft-only until a human intentionally promotes the PR
• Merge policy: human-reviewed only; no autonomous merge is allowed
• Correction policy: use the rollback workflow or a corrective PR/comment when this output is wrong
• Receipts: inspect the linked workflow artifacts before review or merge

Change Surface Policy

• Repo scope: aster parity enforced
• Policy status: allowed
• Surfaces touched: learned_state