L/docs updates 6

[lorenss-m]

Note

Major docs overhaul aligned with v5 scenarios and Environment API.

• Removes legacy/beta pages (e.g., core-concepts/*, build-environments/*, evaluate-agents/*, quickstart, gateway/index-legacy, beta/*) and drops legacy docs version from navigation
• Updates docs/docs.json to version: 0.5.10 and streamlines SDK sections; refreshes examples to use Environment + @env.scenario
• Rewrites migration.mdx to emphasize prompt‑passthrough, local tool calls vs call_tool() for remote, and JSON task format; updates guides/integrations.mdx and reference/agents.mdx to scenario-based usage

Core changes and versioning.

• Adds patch_server_output_validation() in hud/patches/mcp_patches.py to skip structured output validation and auto-generate structuredContent for FastMCP (x-fastmcp-wrap-result), and wires it into apply_all_patches()
• Bumps version to 0.5.10 in pyproject.toml, hud/version.py, and test assertion in hud/utils/tests/test_version.py

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