Add SCM metadata files (STATE, META, ECOSYSTEM)

- STATE.scm: Project state tracking
- META.scm: Architectural decisions and practices
- ECOSYSTEM.scm: Project relationships

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: Jonathan D.A. Jewell

ECOSYSTEM.scm

@@ -0,0 +1,20 @@
+;; SPDX-License-Identifier: PMPL-1.0
+;; ECOSYSTEM.scm - Project relationship mapping
+
+(ecosystem
+  (version "1.0")
+  (name "echidna")
+  (type "project")
+  (purpose "image:https://img.shields.io/badge/License-MPL_2.0-blue.svg[MPL-2.0,link=\"https:")
+
+  (position-in-ecosystem
+    (role "component")
+    (layer "application")
+    (description "image:https://img.shields.io/badge/License-MPL_2.0-blue.svg[MPL-2.0,link=\"https:"))
+
+  (related-projects . ())
+
+  (what-this-is
+    "image:https://img.shields.io/badge/License-MPL_2.0-blue.svg[MPL-2.0,link=\"https:")
+
+  (what-this-is-not . ()))

META.scm

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+;; SPDX-License-Identifier: PMPL-1.0
+;; META.scm - Project metadata and architectural decisions
+
+(define project-meta
+  `((version . "1.0.0")
+    (architecture-decisions . ())
+    (development-practices
+      ((code-style . "standard")
+       (security . "openssf-scorecard")
+       (versioning . "semver")
+       (documentation . "asciidoc")
+       (branching . "trunk-based")))
+    (design-rationale . ())))

STATE.scm

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+;; SPDX-License-Identifier: PMPL-1.0
+;; STATE.scm - Current project state
+
+(define project-state
+  `((metadata
+      ((version . "1.0.0")
+       (schema-version . "1")
+       (created . "2026-01-10T13:48:18+00:00")
+       (updated . "2026-01-10T13:48:18+00:00")
+       (project . "echidna")
+       (repo . "echidna")))
+
+    (current-position
+      ((phase . "Active Development")
+       (overall-completion . 50)
+       (working-features . ())))
+
+    (route-to-mvp
+      ((milestones
+        ((v1.0 . ((items . ("Initial setup" "Core functionality"))
+                  (status . "in-progress")))))))
+
+    (blockers-and-issues
+      ((critical . ())
+       (high . ())
+       (medium . ())
+       (low . ())))
+
+    (critical-next-actions
+      ((immediate . ())
+       (this-week . ())
+       (this-month . ())))
+
+    (session-history . ())))