Add OSA platform presentation page

Add presentations section under OSA docs with:
- YouTube recording embed (full-width)
- Embedded interactive Reveal.js slides
- Summary of key topics covered
- Attribution to Agentic Presentation Builder

Slides built as static files served alongside docs.

Author: neuromechanist

docs/osa/presentations/index.md

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+# Presentations
+
+Talks and presentations about the Open Science Assistant.
+
+| Date | Title | Description |
+|------|-------|-------------|
+| 2026 | [OSA Platform Overview](osa-platform.md) | Architecture, community onboarding, knowledge pipeline, and roadmap |

docs/osa/presentations/osa-platform.md

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+# OSA Platform Overview
+
+An overview of the Open Science Assistant platform: architecture, community onboarding, knowledge pipeline, and roadmap.
+
+## Recording
+
+<div class="embed-container">
+  <iframe
+    src="https://www.youtube.com/embed/Uo0xQZMx534"
+    title="OSA Platform Overview - Recording"
+    frameborder="0"
+    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+    allowfullscreen>
+  </iframe>
+</div>
+
+## Interactive Slides
+
+<div class="embed-container">
+  <iframe
+    src="../slides/osa-platform/presentation.html?presentation=./osa-platform.json"
+    title="OSA Platform Overview - Slides"
+    frameborder="0"
+    allowfullscreen>
+  </iframe>
+</div>
+
+<p class="slide-hint">Use arrow keys to navigate. Press <kbd>F</kbd> for fullscreen, <kbd>?</kbd> for shortcuts.</p>
+
+<style>
+.embed-container {
+  position: relative;
+  padding-bottom: 56.25%; /* 16:9 */
+  height: 0;
+  overflow: hidden;
+  border: 1px solid var(--md-default-fg-color--lightest);
+  border-radius: 8px;
+  margin-bottom: 1.5rem;
+}
+.embed-container iframe {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  border-radius: 8px;
+}
+.slide-hint {
+  margin: -0.5rem 0 1.5rem 0;
+  font-size: 0.75rem;
+  color: var(--md-default-fg-color--lighter);
+}
+.slide-hint kbd {
+  font-size: 0.7rem;
+  padding: 0.1rem 0.3rem;
+  border: 1px solid var(--md-default-fg-color--lightest);
+  border-radius: 3px;
+  background: var(--md-code-bg-color);
+}
+</style>
+
+## Summary
+
+The Open Science Assistant is an extensible AI platform that serves small research communities from a single lab server. Key points covered:
+
+- **Design philosophy**: Precision over features; researchers need accurate, citation-backed answers
+- **Architecture**: Cloudflare Worker edge proxy, FastAPI + LangGraph backend, SQLite FTS5 knowledge stores
+- **Community onboarding**: One YAML file creates a full AI assistant with API routes, tools, and knowledge sync
+- **6 live communities**: HED, EEGLAB, BIDS, MNE-Python, NEMAR, FieldTrip
+- **Two-tier tool system**: Auto-generated knowledge tools from YAML plus custom Python plugins
+- **Knowledge pipeline**: 5 sources (GitHub, OpenALEX, mailing lists, Discourse, docstrings) synced into per-community databases
+- **Smart FAQ generation**: Two-stage LLM pipeline reducing costs by ~85%
+- **Embeddable widget**: One script tag to add an AI assistant to any project website
+- **Future directions**: Multi-assistant delegation across communities, ephemeral preview backends for self-service onboarding
+
+---
+
+<small>Interactive slides built with [Agentic Presentation Builder](https://github.com/casual-vibers/agent-presentation), a JSON-to-Reveal.js presentation tool.</small>

docs/osa/presentations/slides/osa-platform/assets/Tableau10-B-NsZVaP.js

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+function o(e){for(var c=e.length/6|0,n=new Array(c),a=0;a<c;)n[a]="#"+e.slice(a*6,++a*6);return n}const r=o("4e79a7f28e2ce1575976b7b259a14fedc949af7aa1ff9da79c755fbab0ab");export{r as s};

docs/osa/presentations/slides/osa-platform/assets/arc-29arUbpb.js

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+function t(r){return typeof r=="object"&&"length"in r?r:Array.from(r)}export{t as a};

docs/osa/presentations/slides/osa-platform/assets/array-BKyUJesY.js

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+import{aH as o,aI as n}from"./main-BvA2blq7.js";const t=(a,r)=>o.lang.round(n.parse(a)[r]);export{t as c};