test(coverage): add Behave BDD tests to improve unit test coverage across 53 source modules

Add 53 new .feature files and corresponding step definition files targeting
uncovered lines identified in build/coverage.xml. Fix AmbiguousStep conflicts
in 7 pre-existing step files by disambiguating step text.

New tests cover: ACP clients/facade, actor CLI/config, application container,
ACMS service/strategies, async worker, automation profile CLI, autonomy
guardrail, bridge, change model, config CLI/service, context service,
cross-plan correction, database models, decision service, decomposition
clustering/service, discovery handler, langchain chat provider, langgraph
nodes, materializers, multi-project service, plan apply/CLI/lifecycle/model/
preflight/resume/service, PostgreSQL analyzer, project CLI/context CLI,
provider registry, reactive application/route, repositories, resolver handler,
resource registry service, resume model, retry patterns, sandbox protocol,
server CLI, skill CLI/service, skills registry, subplan execution/service,
system CLI, UKO loader, UoW, and YAML template engine.

Closes #645

features/skill_cli_coverage_boost.feature

@@ -0,0 +1,58 @@
+Feature: Skill CLI coverage boost
+  Target remaining uncovered lines in src/cleveragents/cli/commands/skill.py:
+  - Lines 82-103: _get_skill_service DB initialization and fallback
+  - Line 889: tools non-rich format source_type "agent_skills" branch
+  - Lines 984-985: refresh defensive guard for name=None after earlier check
+
+  Background:
+    Given boost- a fresh skill CLI service
+
+  # -------------------------------------------------------------------
+  # _get_skill_service: DB initialization path (lines 82-100)
+  # -------------------------------------------------------------------
+
+  Scenario: _get_skill_service creates service with DB when container is available
+    Given boost- the module-level _service is set to None
+    And boost- the DI container and DB components are mocked successfully
+    When boost- I call _get_skill_service
+    Then boost- the returned service should have a skill_repo
+    And boost- create_engine should have been called with the mock database URL
+
+  # -------------------------------------------------------------------
+  # _get_skill_service: exception fallback (lines 101-103)
+  # -------------------------------------------------------------------
+
+  Scenario: _get_skill_service falls back to in-memory when DB setup fails
+    Given boost- the module-level _service is set to None
+    And boost- the DI container import will raise an exception
+    When boost- I call _get_skill_service
+    Then boost- the returned service should be an in-memory SkillService
+    And boost- the returned service should have no skill_repo
+
+  Scenario: _get_skill_service falls back when create_engine raises
+    Given boost- the module-level _service is set to None
+    And boost- create_engine will raise an OperationalError
+    When boost- I call _get_skill_service
+    Then boost- the returned service should be an in-memory SkillService
+    And boost- the returned service should have no skill_repo
+
+  # -------------------------------------------------------------------
+  # tools non-rich format: agent_skill: source type (line 889)
+  # -------------------------------------------------------------------
+
+  Scenario: Tools JSON output shows agent_skills source for agent_skill entries
+    Given boost- a registered skill "local/agent-skill-test" with agent_skills
+    When boost- I invoke tools "local/agent-skill-test" in format "json"
+    Then boost- the CLI exit code should be 0
+    And boost- the JSON output should be valid
+    And boost- the JSON tools list should contain an entry with source "agent_skills"
+
+  # -------------------------------------------------------------------
+  # refresh: defensive name=None guard (lines 984-985)
+  # -------------------------------------------------------------------
+
+  Scenario: Refresh defensive guard fires when name is None after bypassing first check
+    Given boost- a fresh skill CLI service
+    When boost- I call refresh directly with name None and all_skills False bypassing first guard
+    Then boost- the second guard should have printed the error message
+    And boost- the function should have raised Abort