DEVX-118: feat: enhance documentation-as-code with badges, version refs, Vale

- Fix badge system: clean .badges dir from orphan branch, add version
  verification, make badges job depend on release (avoids stale version
  badge race condition)
- Add check_doc_versions.py: lint tool that verifies docs version
  references match current __version__, with --fix for auto-update
- Integrate check_doc_versions into release process (auto-updates docs
  on every release commit)
- Add Vale prose linter integration: .vale.ini, custom styles for
  terminology and code block language, CI step, make target
- Fix stale version references in docs (0.27.0 → 0.33.4)
- Fix e.g. → for example in docs (Google.Latin Vale rule)
- Add CI steps for check_doc_versions and Vale to quality workflow
- Add make targets: devx-check-doc-versions, devx-vale

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

docs/tech/ci-cd-workflow.md

@@ -93,7 +93,7 @@ Depends on `quality`, `detect-changes`, and `pr-review`. The final job in the
 CI workflow. Runs `python -m devx.ci.auto_merge` with the branch name, PR
 title, repository, and PR number:
 
-1. **Read task ID** from branch name (e.g., `DEVX-12-fix-foo` → `DEVX-12`)
+1. **Read task ID** from branch name (for example, `DEVX-12-fix-foo` → `DEVX-12`)
 2. **Validate PR title format** — must be `{PREFIX}-N: <vikunja task title>`
 3. **Validate PR title matches Vikunja task** — fetches the Vikunja task and
    compares the title
@@ -205,7 +205,7 @@ automation job. Runs `python -m devx.ci.release`:
 8. **Push** — pushes both the commit and tag to master
 
 The script is idempotent: if there are no new conventional commits since the
-last tag, it exits without doing anything. If the tag already exists (e.g.,
+last tag, it exits without doing anything. If the tag already exists (for example,
 from a partial previous run), it skips tag creation and only pushes.
 
 **Tag consistency**: Before releasing, the script fetches remote tags and
@@ -329,7 +329,7 @@ On failure, the `notify_failure` step creates a Gitea issue.
 ### `auto_merge.py`
 
 Auto-merge PR when all CI checks pass. Reads task ID from the branch name
-(e.g., `DEVX-12-fix-foo` → `DEVX-12`). Validates PR title format, checks the
+(for example, `DEVX-12-fix-foo` → `DEVX-12`). Validates PR title format, checks the
 Vikunja task exists and the title matches, extracts the conventional commit
 message from PR commits, and squash-merges with
 `{PREFIX}-N <conventional commit>` title.