[AAASM-3535] 📝 (docs): Add example pages for the 5 new framework adapters

[Chisanan232]

What

Adds per-framework demonstration pages under docs/examples/ for the five frameworks added to the SDK in AAASM-3535, so developers can quickly understand and run each demo:

• New pages: Haystack, Smolagents, Agno, Microsoft Agent Framework.
• Replaced: the stale llamaindex-tool-policy.md ("manual tool policy" via the removed GovernedToolRunner) with the native-adapter LlamaIndex walkthrough — kept the same filename/slug for URL stability.
• Wired all into the Examples nav (mkdocs.yml), the examples index table (examples/index.md), and the adapter ↔ example table (examples/framework-support.md — LlamaIndex's row corrected from "no native adapter" to agent_assembly.adapters.llamaindex).

Each page documents the real hook point, version pins, the offline run command, and expected console output — grounded in the actual agent-assembly-examples app and the shipped adapter.

Why

The docs site's Examples section (https://ai-agent-assembly.github.io/python-sdk/pre-release/examples/) had no walkthroughs for the new frameworks — a gap surfaced after the AAASM-3535 adapters merged. This closes it.

How to verify

• uv run --group docs mkdocs build --strict builds clean (nav + all internal links resolve).
• Hook points / tool names / pins match each example app:
  Haystack Tool.invoke (query_index/summarize_docs allow, execute_sql deny) ·
  Smolagents Tool.__call__ · Agno FunctionCall.execute (execute_sql deny) ·
  MS FunctionTool.invoke (mock + live paths) · LlamaIndex FunctionTool.call/acall.

Refs AAASM-3535.

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