brand(agentplane): add logo asset and capture landscape positioning

LANDSCAPE.md

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+# Agentplane landscape positioning
+
+Intended category: Workflow Orchestration.
+
+Reasoning:
+- execution control plane for bundle -> validate -> place -> run -> evidence -> replay
+- runner-based execution surface
+- replay inputs and lifecycle artifacts
+- runtime governance and receipt-oriented evidence work already on main
+
+Summary tag: Open Source.
+
+Recommended one-line description:
+Execution control plane for governed bundles, executor placement, and run/replay evidence artifacts.
+
+Suggested homepage URL: https://github.com/SocioProphet/agentplane
+Suggested repo URL: https://github.com/SocioProphet/agentplane
+Suggested logo filename: agentplane.svg
+Repo-local logo asset path: assets/agentplane.svg
+
+This file exists so the external listing work is captured in-repo even before the upstream landscape submission is opened.