feat(editing): add automation DOS and planner

[appergb]

Summary

• add standalone editing automation DOS docs under docs/DOS with UI, MCP/Agent, and Swift-alignment call chains
• add opentake-ops intent/planner layer plus atomic AddClipsAutoTrack command
• add lightweight opentake-media analysis primitives for beat, silence, and autocrop v1
• align Rust/Tauri/TS/Agent command contracts, including advanced effects/media library commands and swapMedia narrowing
• wire MCP beat/silence preview tools through CoreHandle PCM analysis while preserving EditCommand as the only write path

Main Sync

This branch is based on the latest origin/main and includes the refreshed Home/Settings UI changes already on main.

Verification

• cargo test -p opentake-domain -p opentake-ops -p opentake-media -p opentake-agent
• cargo test -p opentake-agent
• cargo test -p opentake-tauri edit_request_serde_tests --lib
• cargo clippy -- -D warnings
• pnpm -C web test
• pnpm -C web build
• DOS local link checker: 72 links across 7 files
• git diff --check

Notes

• smart_reframe remains gated on sampled-frame/vision backend access.
• remove_filler_words remains disabled until transcript access is wired.