Add DeepSeek Harness support

[lerogo]

Add DeepSeek Harness support
@Upper9527

[Copilot]

Pull request overview

This PR adds a new “DeepSeek Harness (CLI)” backend to LongHorizon-Harness, wiring it through the model catalog, CLI/doctor, Web API meta payload, supervisor role bindings, and the Web UI so DeepSeek can be selected per role.

Changes:

• Introduces DeepSeekHarnessAdapter plus a deepseek_runner JSONL bridge that executes dsh --profile headless and standardizes results as dsh.result.
• Extends agent/model discovery and Web metadata to include deepseek_harness with a default model (deepseek-v4-flash) and “suggested” discovery provenance.
• Updates CLI, supervisor, snapshot sanitization, and frontend role pickers to accept and display the new backend; adds targeted tests.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/test_model_catalog.py	Adds coverage for DeepSeek model catalog discovery and agent availability.
tests/test_deepseek_harness_adapter.py	New tests for binary resolution, adapter command quoting, runner behavior, JSONL parsing, end-to-end adapter run, and Web meta.
tests/supervisor/test_supervisor.py	Ensures the supervisor can create DeepSeek runs with per-role agent/model bindings.
src/lh_harness/webapi/snapshot.py	Allows deepseek_harness through role config sanitization.
src/lh_harness/webapi/server.py	Includes resolve_dsh_binary() in /api/meta model catalog discovery.
src/lh_harness/utils/agent_cli.py	Adds LH_HARNESS_DSH_BINARY support and resolve_dsh_binary().
src/lh_harness/types.py	Defines DEFAULT_DEEPSEEK_HARNESS_MODEL.
src/lh_harness/supervisor/service.py	Permits DeepSeek in agent validation and default-model resolution for runs/roles.
src/lh_harness/model_catalog.py	Adds DeepSeek to cached discovery, agents list, and model discovery provenance.
src/lh_harness/config.py	Adds deepseek_harness to config agent choices.
src/lh_harness/cli.py	Registers DeepSeek as an agent option, excludes it from MCP/plugin flows, and builds the DeepSeek adapter.
src/lh_harness/agent_logs.py	Adds DeepSeek JSONL detection/parsing and trajectory support for dsh.result.
src/lh_harness/adapters/deepseek_runner.py	New bridge module that runs dsh headlessly and emits normalized JSONL.
src/lh_harness/adapters/deepseek_harness.py	New adapter integrating DeepSeek Harness with role-scoped permissions and isolated DSH_HOME.
src/lh_harness/adapters/init.py	Exposes DeepSeekHarnessAdapter via lazy exports and __all__.
README.zh-CN.md	Documents DeepSeek Harness phase-1 support, setup, and limitations (CN).
README.md	Documents DeepSeek Harness phase-1 support, setup, and limitations (EN).
pyproject.toml	Bumps project version to 0.1.5.
frontend/web/src/App.tsx	Adds DeepSeek to model presets, role runtime picker defaults, and UI notes.

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