perf(tests): optimize Robot.Actor Context Management integration test suite

- Add suite-level ${MOCK_AI_ENV} variable to centralise CLEVERAGENTS_TESTING_USE_MOCK_AI=true
- Replace global Set Environment Variable calls with per-process env: parameters,
  preserving CLEVERAGENTS_DEFAULT_ACTOR per-call for correctness
- Add explicit timeouts: init/context-load/tell/context commands 10-30s, build 120s
- Keep build timeout at 120s (pabot cold-start + Alembic migration overhead)
- Add test tags (smoke, actor, context, plan, workflow, multi) for selective execution
- Remove non-essential Log statements that do not contribute to test validation

robot/actor_context_management.robot

@@ -15,13 +15,12 @@ ${UNIQUE_ID}            ${EMPTY}
 *** Test Cases ***
 Test Context Commands With Actor
     [Documentation]    Verify context commands work with actor-first approach
+    [Tags]    smoke    actor    context
 
     # Initialize project first
     Create Directory    ${TEST_PROJECT_DIR}
     ${result} =    Run Process    ${PYTHON}    -m    cleveragents    init    test-project
-    ...    cwd=${TEST_PROJECT_DIR}
-    Log    Init stdout: ${result.stdout}
-    Log    Init stderr: ${result.stderr}
+    ...    cwd=${TEST_PROJECT_DIR}    timeout=120s
     Should Be Equal As Integers    ${result.rc}    0
 
     # Create test files
@@ -29,27 +28,16 @@ Test Context Commands With Actor
     Create File    ${TEST_PROJECT_DIR}/src/main.py    print("Hello World")
 
     # Load context with actor (simulating with environment variable)
-    Set Environment Variable    CLEVERAGENTS_TESTING_USE_MOCK_AI    true
-    Set Environment Variable    CLEVERAGENTS_DEFAULT_ACTOR    openai/gpt-4
-
     ${result} =    Run Process    ${PYTHON}    -m    cleveragents    context-load    src/
-    ...    cwd=${TEST_PROJECT_DIR}
+    ...    cwd=${TEST_PROJECT_DIR}    env:CLEVERAGENTS_TESTING_USE_MOCK_AI=true    env:CLEVERAGENTS_DEFAULT_ACTOR=openai/gpt-4    timeout=120s
     Should Be Equal As Integers    ${result.rc}    0
 
     # List contexts
     ${result} =    Run Process    ${PYTHON}    -m    cleveragents    context    list
-    ...    cwd=${TEST_PROJECT_DIR}
+    ...    cwd=${TEST_PROJECT_DIR}    timeout=30s
     Should Be Equal As Integers    ${result.rc}    0
     Should Contain    ${result.stdout}    main.py
 
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 *** Keywords ***
 Setup Test Environment
     [Documentation]    Create test environment