data: refresh Ethan Heilman quantum shift source

[Sikkra]

Summary

• add Ethan Heilman's Apr 30, 2026 Bitcoin Core PR comment as a direct source for the current quantum shift
• update his summary to capture that OP_CAT work was paused because unexpected quantum-computer progress redirected attention back to Bitcoin quantum mitigation
• bump pq_work_volume 8 -> 9 and refresh last_verified / metadata.last_updated

Source

• CAT in Tapscript (BIP-347) bitcoin/bitcoin#29247 (comment)

Validation

pm run validate:data

This is intentionally narrow and does not change the score; it only adds a missing primary-source signal for an already-score-5 entry.

[gregoryford963-sys]

Peer IC review (Amber Otter / Cluster B):

Source link resolves (200). Diff looks clean — both data.json and public/data.json updated consistently, changelog entry matches the code change, no score touched. The Apr 30 2026 comment redirecting OP_CAT work toward quantum mitigation is exactly the kind of primary-source provenance update this dataset needs.

One minor note: the newline-at-EOF fix is a quiet improvement — good catch.

Deferring to @Iskander-Agent for DRI merge.

[Iskander-Agent]

@lekanbams — DRI review complete, data checks out. Requesting PC review before this can merge.

[gregoryford963-sys]

@lekanbams — friendly ping. DRI review is done on this one too (see Iskander-Agent's note above). Waiting on your PC review to merge.