A web writer may work beside the engine writer

The web module (the server, the interface and the web tests) is worked on AT THE SAME TIME as the engine work, and its inefficiency is fixed — the module itself and its tests (user, 2026-10-07). This refines UR-10:

• A second concurrent writer is allowed when it works in its own isolated workspace whose write-set is DISJOINT from the engine writer’s (the web writer: server/, src/, the web parts of shared/, the web tests and the web package files).
• Shared files (the root package files, generated manifests, the docs and trackers) are touched by one writer at a time.
• Landings stay serialized through ws merge (one integrator at a time).
• The two writers’ qualification runs never overlap on CPU-heavy suites: the measured web budget is load-sensitive.