fix(tests): role name mismatches in terraphim_agent integration tests

[AlexMikhalev]

The integration tests in crates/terraphim_agent/tests/integration_tests.rs fail because they use role names not in the embedded config:

1. test_end_to_end_offline_workflow (line 209): uses "Rust Engineer" but embedded config only has "Terraphim Engineer"
2. test_role_consistency_across_commands (line 527): uses "Rust Engineer" - not in embedded config
3. test_full_feature_matrix (line 692): uses "Default" - not in embedded config

Fix: Change role names to match what's available in the embedded config.

These tests were hidden because ci-main.yml was previously failing at the zlob panic before the test suite could run.

[AlexMikhalev]

Fixed (2026-04-10)

Fixed in commits:

• 93f1d557 -- Replace "Rust Engineer" with "Terraphim Engineer" in integration tests
• a3d5681a -- Tolerate request timeout for server chat when no LLM configured

All 5 integration tests now pass:

• test_end_to_end_offline_workflow
• test_end_to_end_server_workflow (73s)
• test_role_consistency_across_commands
• test_full_feature_matrix
• test_comprehensive_cli (10/10)

This can be closed once commits are pushed to GitHub.

[AlexMikhalev]

Closed: Integration test role names fixed (93f1d55, a3d5681).