Establish Soul Frame research repository and workplans

Scaffold the research layout from the research program, add INTENT/SCOPE,
research instruments, concept stubs, and SOUL-WP-0001–0008 phase workplans.
Register the repo with State Hub under domain agents for hub-synced execution.

.claude/rules/repo-boundary.md

@@ -0,0 +1,12 @@
+## Repo boundary
+
+This repo owns **soul-frame** only: conceptual research, terminology, literature
+mapping, thought experiments, and the Soul Frame paper pathway.
+
+It does not own:
+
+- Agent runtime / unattended execution → `agent-harness`, `activity-core`
+- LLM routing and provider connectivity → `llm-connect`
+- State Hub implementation → `state-hub`
+- Custodian coordination canon → `the-custodian`
+- Production product surfaces for spirits/ghosts → future application repos