Adds section 2: the operation table (one row per operation present on at least two platforms: KDE Backend method | Windows | macOS | semantic differences), the platform-subsystem table, and the re-measured counts with the exact method. Verified against wip-main aa52fdc4d9e5: K/backend/mod.rs, K/kwin/mod.rs, W/windows_api.rs, W/window.rs, M/macos_api.rs, M/window.rs, M/core_graphics/mod.rs, M/lib.rs. Not verified: how each AX call behaves against real applications (needs a Mac), and the counts are of source text, not of executed calls.
Creates docs/dev/seam.md with sections 1 (purpose and how to read) and the corrections list. Verified against wip-main aa52fdc4d9e5 by reading K/backend/mod.rs, K/kwin/mod.rs, K/kwin/state.rs, M/macos_api.rs, M/window.rs, M/arrival.rs, M/process_event.rs, M/process_command.rs, W/windows_api.rs. Counts quoted here are measured in the next revision. Not verified: any runtime behaviour (the document is reading-only).
LGUG2Z