fix: clarify 7-Tentacles is NOT a language across all AI entry points

Adds constraint #6 to monorepo manifest, CLAUDE.md header warning,
and updates 7-tentacles submodule with its own AI manifest.
AI agents repeatedly misclassify 7-Tentacles as a language because
it sits alongside actual languages in this monorepo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.claude/CLAUDE.md

@@ -1,3 +1,12 @@
+## CRITICAL: 7-Tentacles is NOT a Language
+
+`7-tentacles/` is an educational/pedagogical framework — NOT a programming language.
+It uses My-Lang's four dialects (Me, Solo, Duet, Ensemble) as a curriculum vehicle
+to teach compiler architecture across a 10-year learning trajectory.
+
+**NEVER** audit 7-tentacles as a language. **NEVER** look for grammar/AST/parser/type-system in it.
+When reviewing or auditing languages in this monorepo, **SKIP** the `7-tentacles/` directory.
+
 ## Machine-Readable Artefacts
 
 The following files in `.machine_readable/` contain structured project metadata:

0-AI-MANIFEST.a2ml

@@ -33,6 +33,7 @@ The ONLY valid location is `.machine_readable/`. Do NOT create duplicates.
 3. **No stale metadata** - If root SCMs exist, they are OUT OF DATE and must be removed
 4. **Submodule integrity** - All 10 core languages + 7-tentacles must be checked out (not empty directories)
 5. **License consistency** - All code PMPL-1.0-or-later unless platform requires MPL-2.0 fallback
+6. **7-Tentacles is NOT a language** - It is an educational/pedagogical framework that uses My-Lang's four dialects (Me, Solo, Duet, Ensemble) as a curriculum vehicle. NEVER audit it as a language. NEVER look for grammar/AST/parser/type-system in it. When reviewing languages, SKIP the 7-tentacles/ directory entirely.
 
 ### Session Startup Checklist