Add MkDocs Material documentation site with 40 pages and auto-generated API reference

Sets up a complete documentation website with 7 navigable sections (Home, Getting
Started, User Guide, Architecture, API Reference, Deployment, Development), light/dark
mode, search, code copy, and Mermaid diagram support. API reference pages use
mkdocstrings to auto-generate docs from source docstrings. GitHub Actions workflow
deploys to GitHub Pages on push to main.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/api/telemetry.md

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+# Telemetry Module
+
+The telemetry module provides append-only recording and read-only aggregation
+of inference metrics. Every engine call records timing, token counts, energy
+usage, and cost to SQLite via the event bus. The `TelemetryAggregator`
+provides per-model and per-engine statistics with time-range filtering.
+
+## TelemetryStore
+
+::: openjarvis.telemetry.store.TelemetryStore
+    options:
+      show_source: true
+      members_order: source
+
+---
+
+## TelemetryAggregator
+
+::: openjarvis.telemetry.aggregator.TelemetryAggregator
+    options:
+      show_source: true
+      members_order: source
+
+### ModelStats
+
+::: openjarvis.telemetry.aggregator.ModelStats
+    options:
+      show_source: true
+      members_order: source
+
+### EngineStats
+
+::: openjarvis.telemetry.aggregator.EngineStats
+    options:
+      show_source: true
+      members_order: source
+
+### AggregatedStats
+
+::: openjarvis.telemetry.aggregator.AggregatedStats
+    options:
+      show_source: true
+      members_order: source
+
+---
+
+## Instrumented Wrapper
+
+### instrumented_generate
+
+::: openjarvis.telemetry.wrapper.instrumented_generate
+    options:
+      show_source: true