docs: expand package docstring with CI module overview

Implements: REQ-1, REQ-2

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

docs/specs/DEVX-156.md

@@ -0,0 +1,34 @@
+# DEVX-156: Fix commit message format and release new CI modules
+
+## Problem
+The DEVX-155 merge commit on master has an invalid format
+('DEVX-155: Replace...' missing conventional commit type). This blocks
+the post-merge release workflow's `validate_commit_msg` step, preventing
+`validate_spec`, `check_pr_size`, `nightly_gate`, and `create_dependency_pr`
+from being published to the Gitea PyPI registry. All downstream repos
+(grm, infra, sso-bridge) are blocked — their CI fails with
+`No module named devx.ci.validate_spec`.
+
+## Approach
+Add a trivial user-facing change (version doc comment) with a proper
+conventional commit format to trigger the post-merge release workflow.
+The release will publish the new CI modules that DEVX-155 introduced.
+
+REQ-1: Add a user-facing change to src/devx/ to trigger release
+REQ-2: Ensure the commit message follows conventional format (type: description)
+
+## Test Plan
+- Verify post-merge workflow runs successfully after merge
+- Verify a new release tag is created (v0.51.0 or similar)
+- Verify devx.ci.validate_spec is importable from the published package
+
+## Deploy Plan
+- Merge to master via auto-merge workflow
+- Post-merge workflow auto-releases and publishes
+
+## Rollback Plan
+- Revert the merge commit if release fails
+
+## Acceptance Criteria
+- [x] REQ-1: A user-facing change is added to src/devx/
+- [x] REQ-2: Commit message follows conventional format