overhaul: modular architecture, tests, doc generation, warning system, and UX improvements
- Modular block files: split into blocks-algo, blocks-data, blocks-proc - New modules: sections.js (labelled canvas areas), proc-browser.js (procedure tree modal), lib-loader.js (lazy library loading), templates.js (project templates), errno-data.js (errno table) - Test infrastructure: browser test suite (28 tests) and Node pure-function tests (75 tests) - Warning system: unified .block-warn for disconnected inputs, unconnected error hooks, and zero-exit-in-error-path - Error path highlighting: red flow paths and block borders for error-only subgraphs - Input hooks: hidden by default, shown during linking; outputs always at bottom - Block editor modal: pencil icon, colour picker for accent, compact field labels - Doc generation: standalone node script extracts JSDoc -> docs/API.md (124 declarations) - Persistence: save/restore sections, errno selection, block colours - Fixes: _segmentsIntersect bug, WCEnd crash from closest(this), drawpath guard on detached elements
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