Initialize harness coding docs from design spec

Split docs/softbox-catalog-design.md into the numbered harness doc set
(00-06, api.md, current-state, agent-context, tasks) following the
harness_coding_docs template and soft_quay conventions. Register the
nine open decision items from the design spec into the 06-tasks
roadmap as W- tasks and backlog entries. Keep the original design
spec as an archived design input with a header note.

Recreated after the repository's previous git history was lost to an
external reset; content matches the original initial commit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/agent-context.json

@@ -0,0 +1,56 @@
+{
+  "schema": "docs/agent-context.schema.json",
+  "schema_version": 1,
+  "authority": {
+    "bootstrap": "local_checkout",
+    "framework_templates": "current_repository",
+    "project_facts": "current_project_repository",
+    "coordination": "local_task_files"
+  },
+  "bootstrap": {
+    "always_read": [
+      "AGENTS.md",
+      "docs/00-ai-start-here.md",
+      "docs/05-coding-rules.md",
+      "docs/current-state.md"
+    ]
+  },
+  "routes": {
+    "documentation": [
+      "docs/README.md",
+      "docs/01-vision.md",
+      "docs/02-requirements.md",
+      "docs/softbox-catalog-design.md"
+    ],
+    "protocol": [
+      "docs/api.md",
+      "docs/04-architecture.md",
+      "docs/05-coding-rules.md"
+    ],
+    "data": [
+      "docs/02-requirements.md",
+      "docs/04-architecture.md",
+      "docs/api.md"
+    ],
+    "deploy": [
+      "docs/03-tech-stack.md",
+      "docs/current-state.md"
+    ]
+  },
+  "tasks": {
+    "roadmap": "docs/06-tasks.md",
+    "directory": "docs/tasks/",
+    "template": "docs/tasks/_template.md"
+  },
+  "refresh": {
+    "context_ref": "default_branch_head_sha",
+    "cache_key": "file_sha",
+    "unchanged_file": "reuse_within_current_session",
+    "changed_ref": "reread_manifest_and_routed_documents"
+  },
+  "degraded_mode": {
+    "continue_claimed_task": true,
+    "claim_new_task": false,
+    "write_remote_state": false
+  }
+}