Adds a way to see the query that produced a result and brings the extension README back in sync with the shipped feature set.

Query visibility:

• A collapsible "Query" section above each result table shows the exact query that produced it (verbatim in Query mode, or LLM-generated in Ask/Agent), rendered in a code block with a copy button.
• Adds a "Copy query" item to the result Actions menu for a one-click copy without expanding. Both are shown only when a query is associated with the result (the SQS live view has none).

README refresh (was stale/Bedrock-only):

• "How It Works" now shows the three Send modes (Query/Ask/Agent) instead of a single Bedrock auto-run flow; Query runs verbatim with no LLM.
• Provider-neutral language throughout (Bedrock is one of four: Bedrock, Copilot, local-server, on-device); "How Queries Are Generated" and "Error Handling" no longer assume Bedrock.
• Removed a leftover duplicate "Configure Bedrock" heading.
• Documented result actions (export CSV/JSON, save/copy query, Visualize).
• Settings Reference: bedrockModelId is now "For Bedrock" (not always required); added localModel, agenticMaxIterations, aiDisclosureAcceptedVersion.
• IAM: Bedrock permissions clarified as Bedrock-provider-only; Athena cost note is now mode-aware; Future Work no longer lists shipped features.

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