docs: sync AgentBridge user docs; note Telegram access control

Demo video: picker flash trimmed from start

Demo video: 25fps display capture, office + chat

Demo video: full app view (office + chat panel)

Update OfficeManager demo video: full-res real-time recording (no slow motion, legible bubbles)

OfficeManager demo: smooth 10fps video + derived GIF

OfficeManager showcase: 16-bit agents' office demo video + landing section

AgentBridge showcase: docs, white paper, demo media and landing page

initial commit