Record completion of the Promptkit migration

docs/roadmap/step9.md

@@ -2,9 +2,35 @@
 
 ## Status
 
-Proposed. Steps 1 through 8 of the
-[migration roadmap](migration.md) are complete. This is the final migration
-gate.
+Complete as of 2026-07-28. All steps of the
+[migration roadmap](migration.md) are complete.
+
+## Completion Record
+
+- Promptkit's annotated `v0.1.0` tag remains published at commit
+  `9e68a2bbf779545995270c47842048a3bc6c85dc`; its independent documented
+  validation and fresh remote module resolution passed.
+- Scriptorium's annotated `v0.12.0` tag object
+  `734632371773bb7620ce9f18e79ae179a2a2b44b` resolves to independently
+  validated commit `2f42bdde3957563cb9b7a1e27fdd4ab2516f621a`.
+- The
+  [hosted release](https://gitea.maximumdirect.net/eric/scriptorium/releases/tag/v0.12.0)
+  completed successfully with the checked-in release notes, exactly the Linux
+  `amd64` and `arm64` binaries, and `SHA256SUMS`. Both checksums and binary
+  architectures were verified.
+- Fresh remote module queries resolved both release tags to their expected
+  commits and confirmed that Scriptorium selects Promptkit `v0.1.0`, without a
+  workspace, replacement, vendored sibling source, or local module cache.
+- The downloaded Linux `amd64` binary completed an offline render smoke test.
+  Its existing command interface has no `--help` command, so that invocation
+  returned the expected unknown-command usage response. The Linux `arm64`
+  binary was not executed on the `amd64` validation host; its checksum, format,
+  and target architecture were verified.
+- Notarius at commit `de046a8f13e227676d79c3aa3b685b049902038d`
+  remains migrated to Promptkit and passed its full test suite. No other
+  downstream consumer of the former Scriptorium Go package was identified.
+- Promptkit, Scriptorium, and Notarius were clean and synchronized with their
+  remote main branches after validation.
 
 ## Purpose