refactor: convert nested avow-protocol to a thin binding

standards/avow-protocol/ was a full duplicate that had genuinely
diverged from the real hyperpolymath/avow-protocol repo (roughly a
week apart in currency). Pilots the thin-binding design: centralise
semantics in the canonical repo, localise only a small pointer here.

Before removal, diffed the nested copy against the real repo in full.
avow-lib/ (Idris2 formal-verification tests, ABI source, Zig FFI) had
no home in the real repo, so it was migrated there first:
hyperpolymath/avow-protocol#24 (merged). Everything else remaining was
confirmed superseded by later work in the real repo (AffineScript
.affine sources replaced by ReScript .res, README.adoc converted to
README.md, local issue templates retired for the org's canon) or was
unrendered RSR template scaffold with no real content.

See dev-notes/handoffs/2026-07-02-standards-thin-binding-pilot-handoff.md

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: hyperpolymath