Add CHOA tutorial public discussions (2026-10-07), batch 10

Add CHOA tutorial public discussions (2026-10-07), batch 9

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Add CHOA tutorial public discussions (2026-10-07), batch 3

Add CHOA tutorial public discussions (2026-10-07), batch 2

Add CHOA tutorial public discussions (2026-10-07), batch 1

Add packed-content checksums; index gains sha256; metadata README

Add choa checksums and precise tar index

Merge choa subtree into main (batch 35)

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