Add initial ai tool system, and 2 tools to explore

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+# Changelog — 2026-03-24 (06)
+
+## Added: AI Tool System with Tool Modal and Vault Tools
+
+### New Files
+- **`src/tools.ts`** — Tool registry with `OllamaToolDefinition` schema, `ToolEntry` interface, and two tool implementations:
+  - `search_files` — case-insensitive search of vault file paths (capped at 50 results)
+  - `read_file` — reads full text content of a file by vault path using `cachedRead()`
+  - Each tool has `friendlyName`, `summarize()`, and `summarizeResult()` for UI display
+- **`src/tool-modal.ts`** — `ToolModal` with toggles for each registered tool, persisted via plugin settings
+
+### Modified Files
+- **`src/settings.ts`** — Added `enabledTools: Record<string, boolean>` to settings
+- **`src/main.ts`** — Merges tool states on load to handle new tools added to registry
+- **`src/ollama-client.ts`** — Extended `ChatMessage` with `tool` role, `tool_calls`, `tool_name`. `sendChatMessage` now supports optional tools with full agent loop (up to 10 iterations). `ToolCallEvent` includes `friendlyName`, `summary`, and `resultSummary`
+- **`src/chat-view.ts`** — Added wrench button (highlights when tools active), opens tool modal, passes enabled tools to chat, displays tool calls inline with:
+  - Friendly name header with wrench icon
+  - One-line summary of what the tool did
+  - Result summary line (e.g. "3 results found")
+  - Collapsible `<details>` for JSON args and result preview
+- **`styles.css`** — Styles for tools button (active indicator), tool call blocks (accent border, summary, collapsible details), tool modal description