[api,cli,mcp] fix: reserve dot-segment job ids

[Wangmerlyn]

Summary

• reject standalone URL dot-segment custom job IDs (. and ..) in the centralized session ID contract
• keep dotted IDs such as job.123, ..., and a..b valid
• update CLI/API/MCP docs and AGENTS.md without changing README

Verification

• Red tests before fix: validator and MCP service cases failed for . and .. because they did not raise
• PYTHONPATH=src pytest tests/mcp/test_server.py::test_start_keep_rejects_invalid_job_id_before_starting_controller tests/mcp/test_server.py::test_status_rejects_invalid_job_id_without_changing_sessions tests/mcp/test_server.py::test_stop_keep_rejects_invalid_job_id_without_stopping_sessions -q
• PYTHONPATH=src pytest tests/test_cli_service_commands.py::test_start_command_rejects_local_inputs_before_auto_start tests/test_cli_service_commands.py::test_status_rejects_invalid_job_id_before_rpc tests/test_cli_service_commands.py::test_stop_rejects_invalid_job_id_before_rpc_or_fallback -q
• PYTHONPATH=src pytest tests/utilities/test_session_config.py tests/mcp/test_server.py::test_start_keep_rejects_invalid_job_id_before_starting_controller tests/mcp/test_server.py::test_status_rejects_invalid_job_id_without_changing_sessions tests/mcp/test_server.py::test_stop_keep_rejects_invalid_job_id_without_stopping_sessions tests/mcp/test_server.py::test_mcp_tools_list_exposes_keepgpu_actions tests/mcp/test_http_api.py::test_http_get_rejects_invalid_decoded_job_id_path tests/test_cli_service_commands.py::test_start_command_rejects_local_inputs_before_auto_start tests/test_cli_service_commands.py::test_status_rejects_invalid_job_id_before_rpc tests/test_cli_service_commands.py::test_stop_rejects_invalid_job_id_before_rpc_or_fallback -q
• mkdocs build --strict (passes; known Material/MkDocs 2.0 warning)
• pre-commit run --all-files --show-diff-on-failure
• PYTHONPATH=src pytest tests -q

Local review

• Local subagent review found one minor test-symmetry suggestion; addressed by adding CLI and stop-path ./.. cases.
• Final local subagent review on commit 207b77c6630297a7e589e1e45504f06498708c8b: no critical or important issues; ready to merge.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 38f58087-ea67-4cb8-953e-43eace56a61c

📥 Commits

Reviewing files that changed from the base of the PR and between aae62de and 207b77c.

📒 Files selected for processing (10)

• AGENTS.md
• docs/guides/cli.md
• docs/guides/mcp.md
• docs/reference/api.md
• docs/reference/cli.md
• src/keep_gpu/utilities/session_config.py
• tests/mcp/test_http_api.py
• tests/mcp/test_server.py
• tests/test_cli_service_commands.py
• tests/utilities/test_session_config.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/job-id-dot-segments

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