[woensug-choi]

POSIM users can choose an operating-system setup, run a graphical simulation, then follow focused guides for sensor data, robot control and custom experiments. POSIM is presented as the complete open-source maritime robotics simulation library.

Documentation and distribution changes:

• Separate Ubuntu native, Linux Docker, Windows WSL native, Windows WSL Docker and macOS Docker/RDP guides. Explain terminal A/B and workspace setup before the first exercise; end installation with the ocean demo.
• Move the source-directory table into Features, remove the separate related-libraries chapter, and explain WWW-POSIM only as an application built with POSIM. Embed its introduction video and preserve moved page/section bookmarks.
• Split control, observation and advanced tutorials; keep plugin quickstarts, SDF and parameter tables near the top. Add world, sensor and robot creation exercises with measurable results.
• Add full-text section search, highlighted code, overlay copy buttons, larger navigation groups and video buffering/error/retry feedback.
• Publish architecture images under source-revision tags and promote a complete AMD64/ARM64 manifest to latest only after both builds succeed. PR builds do not publish. Runtime images exclude website sources; unused POSIM runner images expire after two days.

Runtime corrections include sonar build/install/logging/timestamp/teardown fixes; GNSS, DVL, current/coordinate, USBL and pressure validation; camera timestamp pairing and reset handling; REXROV inertia; ArduSub dependency loading; and surface launch readiness failures. The surface image starts its RDP services as root and runs the desktop session under its regular account.

Validation completed:

• All 23 packages build. The full registered suite reports 342 results across 15 packages with no failures, errors or skips; subsequent runtime fixes have targeted checks. All 81 sensor cases pass.
• The English/Korean website builds 74 pages and checks 7,393 local links/anchors. All 9 Playwright tests pass, covering desktop/mobile layout, themes, copying, search, language selection, bookmark redirects and video playback/retry. Screenshots were reviewed.
• World pressure, IMU rates, Python subscription and neutral-thrust shutdown, custom-model creation, BlueROV2/MAVROS connectivity and documented sensor examples have runtime checks. A fresh Ubuntu 26.04 WSL environment completes the dependency installer.

Still in progress in this draft:

• Full documentation and interface localization into English, Korean, Spanish, French, German, Italian, Japanese and Chinese, using established robotics terminology.
• Current main image publication and OS-specific image/GUI checks. ARM64 publication has completed; AMD64 and the combined latest manifest are still running.
• QGroundControl connection and control verification. The WSL simulation connects and supplies vehicle state/location; only fully tested usage will be documented.

Related work: #52 is incorporated with authorship retained. #53 remains a separate optional MAVROS overlay. Internal receipts and temporary verification harnesses are ignored and excluded from this PR.