chore: extract groove-protocol/ to top-level hyperpolymath/groove-protocol (#228)

## Summary

Groove Protocol graduates from a sub-spec under `standards/` to a
top-level repo, sitting alongside its companion engineering product
`groove-browser-harness`. This matches the SNIFs / typed-wasm precedent
for named-boundary tools: they live at top level.

**New repo**: https://github.com/hyperpolymath/groove-protocol (created
2026-05-28, public, 2-commit history preserved via `git filter-repo
--subdirectory-filter groove-protocol`)

## What this PR does

- Removes the 33 files of `standards/groove-protocol/` (now living at
the new top-level repo).
- Updates the one internal reference:
`docs/audits/dogfooding-matrix-2026-04-04.md` row 36 now points at the
new repo.

## Companion cross-repo PRs (filed separately)

External references to `standards/groove-protocol` exist in:
- `hypatia` — `docs/testing/audit.md` + `src/ui/gossamer/README.adoc`
- `developer-ecosystem` — `UNIFIED-ZIG-API-STACK.adoc` +
`zig-ecosystem/connectors/zig-groove-bridge/` (3 files)
- `gitbot-fleet` — `scripts/fix-missing-groove.sh`
- `idaptik` — `STAPEL-VOLL-AUDIT.md`
- `proven` — `.claude/settings.local.json` (local-only, may not need a
PR)

## Out of scope

- The 93 `.well-known/groove/manifest.json` files across the estate:
none embed `standards/groove-protocol` — they carry only service IDs and
capabilities, so they need no change.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

docs/audits/dogfooding-matrix-2026-04-04.md

@@ -33,7 +33,7 @@ Each section tracks a dogfooding dimension. Status key:
 | feedback-o-tron soft groove | .well-known/groove/manifest.json | PUSHED ✓ |
 | Testing taxonomy v1.1.0 | standards/testing-and-benchmarking | PUSHED ✓ |
 | HYP-DOG-001..010 rules in Hypatia | hypatia/lib/rules/dogfooding.ex | PUSHED ✓ |
-| Groove CLI tool | standards/groove-protocol/cli/ | PUSHED ✓ |
+| Groove CLI tool | hyperpolymath/groove-protocol cli/ (extracted from standards/ 2026-05-28) | PUSHED ✓ |
 | VeriSimDB wiring (ambientops) | observatory + personal-sysadmin + referrals | PUSHED ✓ |
 | pre-commit hooks deployed | ~150 repos (.pre-commit-config.yaml) | PUSHED ✓ |
 | gitbot-fleet fix scripts | fix-missing-groove.sh + fix-stale-template-placeholders.sh | PUSHED ✓ |