Hub reliability hardening, code UX polish, and site updates.

Reduced duplicate Docker release workflow triggers to cut redundant image builds and improve release efficiency.

Bumped `OPENCLAW_VERSION` to the latest runtime revision used by the release pipeline.

Consolidated QA/prod image tagging onto a single `mb-base` repository and added generated `mb-browser` pack tier support.

Pinned Playwright/browser install versions and corrected the `mb-browser` Chrome symlink target for Chromium tiers.

Updated embedded `src/OPENCLAW_VERSION` to the latest OpenClaw runtime revision.

Decoupled agent presence updates from metadata persistence and hardened startup/realtime handler behavior.

Hardened audit hydration and deduplicated endpoint-builder wiring across discovery and v1 handler paths.

Added OpenClaw realtime activity ingest endpoints with OpenAPI docs and test coverage so agents can publish activity events.

Fixed Hub UI widescreen overlap/alignment issues across history, reviewer, and repository controls.

Restored history-view delete actions, running-task deselection behavior, and completion-audio playback.

Added transport fallback and per-session activity emission for Hub-connected sessions to improve unreliable-connection behavior.

Updated profile/registration flow to honor `metadata.llm`, surface done state earlier, and support auto-init for uninitialized repositories.

Added contributor-history ranking prompt to library catalog and tightened seeded AGENTS constraints in harness prompts.

Refined `/hub` activity graph presentation by removing "MSGS", expanding 21-day cube layout, and dropping top-right totals.

Removed OpenClaw footer links to simplify global navigation while keeping OpenClaw page SEO handling intact.

Published UTC release feed entries for 2026-04-16 and 2026-04-17 and iterated supporting hub stats/logo content updates.