feat: establish read-only DocForge MCP foundation

tests/fixtures/alpha/.docforge/project.toml

@@ -0,0 +1,31 @@
+schema_version = 1
+project_id = "alpha-docs"
+title = "Alpha Documentation"
+adapter = "generic"
+
+[sources]
+content_roots = ["docs/content"]
+authority_files = ["POLICY.md"]
+
+[derived]
+cache_root = ".docforge/cache"
+index = ".docforge/cache/index.sqlite3"
+
+[graph]
+allowed_relations = ["depends_on", "proves", "supersedes", "relates_to", "returns_to"]
+
+[limits]
+max_source_bytes = 100000
+max_nodes = 100
+max_query_chars = 200
+max_results = 20
+max_traversal_depth = 4
+max_context_tokens = 2000
+
+[[profiles]]
+id = "active"
+families = ["guide", "proof"]
+statuses = ["active", "approved"]
+required_nodes = ["guide.workflow"]
+token_budget = 600
+dependency_depth = 2