feat: extract reusable dev/CI tools from GRM into devx package

Port core modules (config, exceptions, i18n, api_clients, gitea_cli),
14 CI scripts, 6 dev tools, 5 molecule tools, CLI entry point, workflows,
Makefile, tests (784 tests, 100% coverage), and documentation from GRM.

The devx package is published to the Gitea PyPI registry and consumed
by GRM, infra, and other oblachno-oss projects as a pip dependency.

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

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

cliff.toml

@@ -0,0 +1,68 @@
+# git-cliff configuration for devx
+# https://git-cliff.org/docs/configuration
+
+[changelog]
+header = """
+# Changelog\n
+All notable changes to this project will be documented in this file.\n
+"""
+body = """
+{% if version %}\
+    ## [{{ version | trim_start_matches(pat="v") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+{% else %}\
+    ## [unreleased]
+{% endif %}\
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | striptags | trim | upper_first }}
+    {% for commit in commits %}
+        - {% if commit.scope %}*({{ commit.scope }})* {% endif %}\
+            {% if commit.breaking %}[**breaking**] {% endif %}\
+            {{ commit.message | upper_first }}\
+    {% endfor %}
+{% endfor %}
+"""
+trim = true
+render_always = true
+
+[git]
+conventional_commits = true
+filter_unconventional = true
+require_conventional = false
+split_commits = false
+protect_breaking_commits = false
+filter_commits = false
+fail_on_unmatched_commit = false
+use_branch_tags = false
+topo_order = false
+topo_order_commits = true
+sort_commits = "oldest"
+recurse_submodules = false
+
+commit_preprocessors = [
+    # Strip DEVX-N task ID prefix from merge commits so git-cliff sees conventional commits
+    { pattern = "^DEVX-\\d+\\s+", replace = "" },
+]
+
+commit_parsers = [
+    { message = "^feat", group = "<!-- 0 -->Features" },
+    { message = "^fix", group = "<!-- 1 -->Bug Fixes" },
+    { message = "^perf", group = "<!-- 4 -->Performance" },
+    { message = "^refactor", group = "<!-- 2 -->Refactor" },
+    # Skip infrastructure-only commits — they don't affect users
+    { message = "^doc", skip = true },
+    { message = "^test", skip = true },
+    { message = "^style", skip = true },
+    { message = "^chore", skip = true },
+    { message = "^ci", skip = true },
+    # Skip release commits — they are release artifacts, not features
+    { message = "^release:", skip = true },
+    { body = ".*security", group = "<!-- 8 -->Security" },
+    { message = "^revert", group = "<!-- 9 -->Revert" },
+    # Skip anything that doesn't match above — safe default
+    { message = ".*", skip = true },
+]
+
+[bump]
+features_always_bump_minor = true
+breaking_always_bump_major = false
+initial_tag = "0.1.0"