fix(template): replace get_state_summary with get_domain_summary in domain CLAUDE.md template

Avoids ~12.9k token response in domain repo sessions; get_domain_summary
returns the same actionable data scoped to the domain at ~10% of the cost.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

state-hub/scripts/project_claude_md.template

@@ -76,7 +76,7 @@ Terminology and workflows: `http://localhost:3000/docs/inter-repo-communication`
 
 ### First Session Protocol
 
-Triggered when `get_state_summary()` shows **no workstreams** for the `{DOMAIN}`
+Triggered when `get_domain_summary("{DOMAIN}")` shows **no workstreams** for the `{DOMAIN}`
 topic. The project is registered but work has not yet been structured.
 
 **Step 1 — Understand the project (read, don't write)**
@@ -125,7 +125,7 @@ Work items MUST originate as files in this repo before being registered in the h
 
 When another domain's agent identifies work for this repo, it creates a state hub
 task with `[repo:{REPO_SLUG}]` in the title (an **ecosystem todo**). You will
-see it at session start via `get_state_summary()`. When you pick it up, create
+see it at session start via `get_domain_summary("{DOMAIN}")`. When you pick it up, create
 the corresponding workplan file in `workplans/` (ADR-001) and begin work.
 
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