docs: fix AGENTS.md noun representation (3 tags, not 4)#4
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TAG_CONTENT never existed in the implementation. The actual scheme is: bit 63=0 → direct atom, bits 63:62=10 → indirect atom (BLAKE3 content-addressed), bits 63:62=11 → cell. No fourth tag. Clarifies that: - Indirect atoms are already content-addressed (hash IS identity) - BLAKE3 is computed eagerly at alloc time, not lazily - Phase 12 cold store uses the same tag-10 representation - The stale TAG_CONTENT/TAG_DIRECT defines are removed Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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TAG_CONTENT never existed in the implementation. The actual scheme is: bit 63=0 → direct atom, bits 63:62=10 → indirect atom (BLAKE3 content-addressed), bits 63:62=11 → cell. No fourth tag.
Clarifies that: