chore: update STATE.scm with version-stable infrastructure

- Increased overall completion to 95%
- Added version-automation component (100%)
- Documented new features: version-stable structure, migration automation
- Updated session history with all versioning work
- Completion reflects production-ready infrastructure

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Your Name

.machine_readable/STATE.scm

@@ -17,10 +17,11 @@
 
   (current-position
     (phase "v1.0-stable")
-    (overall-completion 90)
+    (overall-completion 95)
     (components
       (license-text 100)
       (repository-structure 100)
+      (version-automation 100)
       (documentation 95)
       (tooling 75)
       (governance 95)
@@ -29,9 +30,14 @@
   (working-features
     ("PMPL-1.0 license text finalized and stable")
     ("v1.0/ directory as canonical frontpage")
+    ("Version-stable structure that never shapeshifts")
+    ("Automated version migration script (v1.0 → v1.1, etc.)")
     ("Legacy v0.x materials consolidated in ARCHIVE/")
     ("README.adoc prominently highlights v1.0")
     ("Quick Start guide available")
+    ("Machine-readable metadata in .machine_readable/ (6SCM)")
+    ("Build automation in contractiles/ directory")
+    ("AI.djot entry point for AI agents")
     ("Rust tooling (pmpl-sign, pmpl-verify, pmpl-audit) functional")
     ("SPDX identifier: PMPL-1.0-or-later")
     ("Compatible with MIT, BSD, Apache-2.0, MPL-2.0, LGPL, GPL"))
@@ -80,4 +86,12 @@
         ("Legacy v0.x materials consolidated into ARCHIVE/")
         ("Created v1.0/README.adoc and v1.0/docs/QUICK-START.adoc")
         ("Moved GUIDES_v0.4, METADATA_v0.4, TOOLKIT_v0.4 into ARCHIVE/v0.4/")
-        ("v1.0 is now unmistakably the current, stable version")))))
+        ("v1.0 is now unmistakably the current, stable version")
+        ("Created VERSIONING_POLICY.adoc - complete version management strategy")
+        ("Created REPOSITORY_STRUCTURE.adoc - canonical structure documentation")
+        ("Built scripts/migrate-version.jl - automated version migration")
+        ("Organized 6SCM files in .machine_readable/ with root symlinks")
+        ("Created contractiles/ directory for build automation")
+        ("Added AI.djot - AI agent entry point and instructions")
+        ("Removed duplicate files (CONTRIBUTING.adoc, CHANGELOG.md, LICENSE.md)")
+        ("Repository now version-stable - will not shapeshift on future releases")))))