Format all agent RAG tool results as human-readable text

[Copilot]

The AI synthesizer was claiming it had no data (e.g. "I don't have access to the current bitcoin price") even when tools had successfully returned results, because raw JSON (or raw HTML from the search tool) was being passed into the RAG context — hard for the model to reliably extract values from.

Changes

agent/agent.go

• Replaced the ad-hoc if/else RAG-formatting chain with a central formatToolResult(toolName, result, args) dispatcher covering every tool
• Added human-readable text formatters for all previously unformatted tools:
  • formatNewsResult — handles both {"feed":[...]} and {"results":[...], "query":"..."} shapes
  • formatVideoResult — numbered titles + channel names
  • formatWeatherResult — current conditions + 5-day forecast; uses PascalCase field names matching actual WeatherForecast struct serialization
  • formatReminderResult — name of Allah, verse, hadith, message
  • formatSearchResult — tries JSON; falls back to stripHTMLTags since /search returns a full HTML page
  • formatBlogResult — numbered posts with author, tags, content snippet
  • formatWebSearchResult — numbered results with title and snippet
• Added stripHTMLTags helper (collapses whitespace, caps at 2000 chars)

Example output passed to the synthesizer for a markets query:

Live crypto market prices:
- BTC: $97,000.12 (24h change: +1.23%)
- ETH: $3456.78 (24h change: -0.45%)

agent/agent_test.go

• Added tests for each new formatter covering the normal, empty-data, and invalid-JSON/fallback cases, plus the central dispatcher and stripHTMLTags

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