feat: sync missing features from v0.49.x line to master

The v0.49.x tag line diverged from origin/master, leaving many
features only accessible via tags but not on the master branch.

New modules:
- ci/cancel_superseded_runs.py — cancel superseded CI runs
- ci/check_workflow_artifact_deps.py — validate artifact deps
- ci/check_workflow_tofu_init.py — validate tofu init steps
- tools/check_alert_rules.py — validate Prometheus alert rules
- tools/check_ansible_set_fact_to_json.py — lint set_fact usage
- tools/check_docker_init.py — validate Docker init scripts
- utils/jinja.py — Jinja2 template utilities
- utils/ui.py — UI/console utilities

Modified modules:
- distribute_molecule.py: add --include-roles/--exclude-roles
- utils/api.py: add container.credentials for private registry auth
- install_tools.py: retry ansible-galaxy on transient timeouts
- setup_image.py: skip dep resolution with --no-deps
- cli.py: register new commands
- i18n.py: add new translation keys

Also removes accidentally committed .vale/styles/Google/ files.

Test results: 2195 passed, 100% coverage.

Generated with [Devin](https://devin.ai)

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

docs/user/cli-commands.md

@@ -85,7 +85,7 @@ devx ci detect-release-commit
 
 Discover available Gitea Actions runners for dynamic job distribution.
 Queries the Gitea API for registered runners at repository, organization, and
-instance (admin) levels. Falls back to `MOLECULE_RUNNERS` repo variable or
+instance (administrator) levels. Falls back to `MOLECULE_RUNNERS` repo variable or
 `DEFAULT_MAX_RUNNERS` (3).
 
 ```bash
@@ -315,6 +315,56 @@ devx ci validate-commit-msg commit-msg.txt --branch master
 Options:
 - `--branch <branch>` — override branch detection (for CI use)
 
+### `devx ci cancel-superseded-runs`
+
+Cancel in-flight CI runs for the same PR branch when a new push triggers
+a new run. Uses the Gitea Actions API to list running pull_request runs
+and cancel those with a lower run ID on the same branch.
+
+```bash
+devx ci cancel-superseded-runs \
+    --repo "$REPOSITORY" \
+    --current-run-id "$GITHUB_RUN_ID" \
+    --head-branch "$HEAD_REF"
+```
+
+Options:
+- `--repo <owner/repo>` — repository (required)
+- `--current-run-id <id>` — current run ID, not cancelled (required)
+- `--head-branch <branch>` — PR head branch name (required)
+- `--dry-run` — list superseded runs without cancelling
+- `--base-url <url>` — Gitea base URL (default: `GITEA_API_URL` env var)
+
+### `devx ci check-workflow-artifact-deps`
+
+Verify that workflow jobs downloading artifacts depend on the uploading
+job. Prevents the class of bug where a download job runs in parallel
+with the upload job and fails because the artifact isn't available yet.
+
+```bash
+devx ci check-workflow-artifact-deps
+devx ci check-workflow-artifact-deps --workflow .gitea/workflows/ci.yml
+```
+
+Options:
+- `--workflow <path>` — check a specific workflow file
+- `--workflows-dir <path>` — override workflows directory
+
+### `devx ci check-workflow-tofu-init`
+
+Verify that workflow jobs using tofu state (tofu output/plan/apply or
+scripts that call them) have a tofu-init step in the same job.
+
+```bash
+devx ci check-workflow-tofu-init
+devx ci check-workflow-tofu-init --workflow .gitea/workflows/deploy.yml
+```
+
+Options:
+- `--workflow <path>` — check a specific workflow file
+- `--workflows-dir <path>` — override workflows directory
+- `--state-script <name>` — add a script that uses tofu state (repeatable)
+
 ## Tools Commands
 
 ### `devx tools check-test-speed`
@@ -323,7 +373,7 @@ Run unit tests and enforce execution-time budgets. Two quality gates:
 
 - **Total suite time** must not exceed `--max-seconds` (default: 10s)
 - **Per-test time** — no individual test may exceed `--max-single-seconds`
-  (default: 0.5s, 0 to disable)
+  (default: 0.5s, 0 to turn off)
 
 Runs `make test-unit` with `PYTEST_ADDOPTS=--durations=0` so pytest emits
 per-test timing lines.
@@ -369,7 +419,7 @@ devx tools check-test-isolation --src-dir src/
 
 Pytest plugin options (automatic when devx is installed):
 
-- `--no-test-isolation` — disable static analysis and runtime subprocess audit
+- `--no-test-isolation` — turn off static analysis and runtime subprocess audit
 - `--test-isolation-max-loop N` — max iterations per loop (default: 100)
 
 ### `devx tools configure-repo`
@@ -414,7 +464,7 @@ devx tools generate-cliff-config --prefix GRM --force  # overwrite existing
 Options:
 - `--prefix <prefix>` — task ID prefix (default: `DEVX_TASK_PREFIX` env var
   or `DEVX`)
-- `--output <file>` — output file path (default: `cliff.toml`)
+- `--output <file>` — output path (default: `cliff.toml`)
 - `--force` — overwrite existing file
 
 ### `devx tools install-checkmake`
@@ -488,6 +538,56 @@ devx tools pr-rebase                       # auto-detect PR from current branch
 Options (pass after `--`):
 - `--pr <N>` — PR number (auto-detected from current branch if omitted)
 
+### `devx tools check-docker-init`
+
+Check that Docker Compose services with healthchecks have `init: true`.
+Without `init: true`, CMD-SHELL healthchecks spawn child processes that
+become zombies when PID 1 doesn't reap them.
+
+```bash
+devx tools check-docker-init
+devx tools check-docker-init --path path/to/docker-compose.yml.j2
+```
+
+Options:
+- `--path <path>` — check a specific file or directory
+- `--templates-dir <path>` — override templates directory (default: `ansible/roles/`)
+
+### `devx tools check-ansible-set-fact-to-json`
+
+Check that Ansible `set_fact` tasks don't misuse `| to_json`. Using
+`to_json` in `set_fact` converts native Python types to JSON strings,
+causing iteration bugs (for example, iterating over characters instead
+of list items).
+
+```bash
+devx tools check-ansible-set-fact-to-json
+devx tools check-ansible-set-fact-to-json --path path/to/playbook.yml
+```
+
+Options:
+- `--path <path>` — check a specific file or directory
+- `--ansible-dir <path>` — override ansible directories (repeatable)
+
+### `devx tools check-alert-rules`
+
+Validate rendered Prometheus alert rules with `promtool check rules`.
+Renders a Jinja2 template with test values and validates the output.
+Skips (exits 0) if promtool is not on PATH.
+
+```bash
+devx tools check-alert-rules \
+    --template-path ansible/roles/observability/templates
+devx tools check-alert-rules \
+    --template-path ansible/roles/observability/templates \
+    --var grafana_base_url=https://grafana.example.com
+```
+
+Options:
+- `--template-path <path>` — path to templates directory (required)
+- `--template-name <name>` — template filename (default: `alert-rules.yml.j2`)
+- `--var key=value` — template variables (repeatable)
+
 ## Molecule Commands
 
 Molecule commands require the `molecule` extra (`pip install devx[molecule]`).
@@ -531,3 +631,29 @@ Options:
 - `--list-platforms` — list all platforms, one per line
 - `--roles-root <dir>` — roles root directory for multi-role repos (default:
   `ansible/roles`)
+
+### `devx molecule guard`
+
+Run molecule tests sequentially with CI failure polling. A background thread
+polls the Gitea API. If any other molecule matrix runner reports failure, the
+current molecule subprocess is killed and this runner exits early with code 1.
+
+```bash
+devx molecule guard pair1 pair2 pair3
+devx molecule guard --roles-root ansible/roles pair1 pair2
+```
+
+Each pair is encoded as:
+- **Single-role (4-part):** `scenario|platform_name|platform_image|platform_command`
+- **Multi-role (5-part):** `role|scenario|platform_name|platform_image|platform_command`
+
+Options:
+- `--roles-root <dir>` — roles root directory for multi-role repos
+
+Environment variables:
+- `GITEA_URL` — base URL of the Gitea instance
+- `CI_GITEA_TOKEN` — API token with repo access
+- `RUN_ID` — workflow run ID (`GITHUB_RUN_ID`)
+- `JOB_NAME` — base job name (`GITHUB_JOB`)
+- `MATRIX_INDEX` — current matrix index (runner-index)
+- `GITEA_REPOSITORY` — repository in `owner/repo` format