feat(autogen-ext): add confirmation-gated TaskMarket Workbench

[Emma Johnson (a1271981054)]

Summary

• add an optional TaskMarketWorkbench to autogen-ext for public task discovery and human-reviewed task creation
• require an exact preview, confirm=True, application approval, Base/USDC network validation, and sufficient balance before a CLI write
• never accept private keys, accept/reject submissions, interpolate a shell command, or retry an ambiguous write
• add focused tests, package documentation, and the taskmarket optional dependency extra

Fixes #8051

Validation

• pytest packages/autogen-ext/tests/tools/test_taskmarket_workbench.py -vv -s --no-cov — 7 passed
• Ruff format/check — passed
• Mypy on the new module and tests — no issues in 3 source files
• Pyright on the new module and tests — 0 errors
• uv build --package autogen-ext — source distribution and wheel built; wheel contains autogen_ext/tools/taskmarket/
• read-only live smoke against https://api.taskmarket.dev/api/tasks — returned a public open task

The whole tests/tools directory was also attempted, but collection requires optional dependencies not present in this environment (mcp, graphrag, and json_schema_to_pydantic) and reaches an existing Azure fixture NameError; the new focused test module remains green.

Security notes

Task creation is opt-in and delegates wallet operations to the first-party CLI. Preview state is ephemeral and is not serialized. A timed-out or otherwise ambiguous write returns status: unknown with retry: false, so callers must reconcile live status before taking any further action.

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