instructions: the agent speaks the KB language in chat - AGENTS.md § Conversation language, and instructions sync compiles the language tag into every published SKILL.md (#116); 10.0.0-beta.9

Files changed:
- AGENTS.md
- CHANGES.md
- VERSION
- docs/explanation/language-boundaries.md
- docs/reference/commands/types-instructions-and-docs.md
- instructions/CONTRACT.md
- instructions/dev/stack-build/SKILL.md
- instructions/dev/stack-close/SKILL.md
- instructions/dev/stack-dev/SKILL.md
- kb/CONVENTIONS.md
- kb/CONVENTIONS.md.template
- tools/CONTRACT.md
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/instructions_cmd.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_instructions_cmd.py

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

kb/CONVENTIONS.md

@@ -51,9 +51,10 @@ the control plane and stays English - the same prose/identifier cut
 [kb/CONTRACT.md](CONTRACT.md#language-and-identifiers) makes inside a page, applied one level up.
 `raw/` is untouched ([raw/CONTRACT.md](../raw/CONTRACT.md)).
 
-Two things follow from that value rather than being decided here, both stated once in
-[AGENTS.md § File naming](../AGENTS.md#file-naming): the control plane stays English whatever an
-instance writes its pages in, and an agent *speaks* the language named above.
+Two things follow from that value rather than being decided here: the control plane stays English
+whatever an instance writes its pages in ([AGENTS.md § File naming](../AGENTS.md#file-naming)),
+and an agent *speaks* the language named above
+([AGENTS.md § Conversation language](../AGENTS.md#conversation-language)).
 
 The first of those is not a setting this file withholds - it is not a setting at all. `language:`
 above is the only language value in the tree, and what it binds is page text; a control-plane