Python: Add a read-only TaskMarket delegation sample

[dacode-dev]

Related issue: #7615

Adds a focused Python sample showing how Agent Framework can expose TaskMarket discovery as agent tools.

• discovers open public tasks with text, reward, and result-limit filters
• inspects an exact task ID after strict validation
• uses the standard-library HTTP client and no TaskMarket credentials
• explicitly does not claim, bid, submit, create, accept, sign, or spend
• includes offline unit tests and run instructions

Checks: python3 -m unittest discover -s samples/02-agents/tools -p "test_taskmarket_client.py"; python3 -m py_compile samples/02-agents/tools/taskmarket_client.py samples/02-agents/tools/taskmarket_delegation.py.

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[Copilot]

Pull request overview

Adds a read-only Python TaskMarket delegation sample for discovering and inspecting public tasks through agent tools.

Changes:

• Adds a standard-library TaskMarket API client.
• Exposes discovery and inspection as Agent Framework tools.
• Adds documentation and offline unit tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
taskmarket_client.py	Implements API access and task normalization.
taskmarket_delegation.py	Defines tools and configures the agent.
test_taskmarket_client.py	Tests filtering, normalization, and ID validation.
TASKMARKET_README.md	Documents safeguards, setup, and checks.
README.md	Lists the new sample.

Suppressed comments (1)

python/samples/02-agents/tools/test_taskmarket_client.py:52

• This second object annotation also makes both return_value and assert_called_once invalid attribute accesses under the samples type checks. Use the patched mock type here as well.

    def test_exact_task_is_read_only(self, urlopen: object) -> None:
        task_id = "0x" + "c" * 64
        urlopen.return_value = FakeResponse({"id": task_id, "reward": "1000000", "status": "open"})

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