feat(grid-agent): establish architecture and config (#118)

ci/dependency-policy.json

@@ -36,6 +36,7 @@
     { "name": "tar", "versions": ["0.4.46"], "purpose": "Bounded OAR, asset, and release-package archive traversal", "maintenance": "active", "transitive_cost": "low", "native": false, "rewrite_anchor": "`tar`" },
     { "name": "tokio", "versions": ["1.53.1"], "purpose": "Shared asynchronous networking, timers, channels, and tasks", "maintenance": "active", "transitive_cost": "medium", "native": false, "rewrite_anchor": "`tokio`" },
     { "name": "unicode-general-category", "versions": ["1.1.0"], "purpose": "Unicode category matching in the LSL lexer", "maintenance": "stable", "transitive_cost": "low", "native": false, "rewrite_anchor": "`unicode-general-category`" },
+    { "name": "url", "versions": ["2.5.8"], "purpose": "Exact validation and credential-safe diagnostic redaction for grid-agent HTTP endpoints", "maintenance": "active", "transitive_cost": "medium", "native": false, "rewrite_anchor": "`url`" },
     { "name": "uuid", "versions": ["1.24.0"], "purpose": "Random UUID generation behind protocol-compatible wrappers", "maintenance": "active", "transitive_cost": "low", "native": false, "rewrite_anchor": "`uuid`" },
     { "name": "vcpkg", "versions": ["0.2.15"], "purpose": "Windows MSVC native library discovery in reviewed adapters", "maintenance": "stable", "transitive_cost": "low", "native": false, "rewrite_anchor": "`vcpkg`" },
     { "name": "vorbis_rs", "versions": ["0.5.6"], "purpose": "Opt-in Ogg Vorbis asset encoding", "maintenance": "monitored-native", "transitive_cost": "medium", "native": true, "rewrite_anchor": "`vorbis_rs`" }