Feat/rehydrate optimization - #179
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…g a page A morph does not re-execute the page's scripts, and refetched page bytes are the pre-hydration build output, so a package whose script does work at boot had that work reverted with nothing re-running to redo it. The widget was left drawn as though it had never started, and nothing threw. A package now declares `js_rehydrate = true` in its `[tool.rheo.<format>]` block and pushes a callback onto `window.__rheoRehydrate`. Declaring scripts render with `data-rheo-rehydrate`; the live client surveys every script on the page before morphing and reloads instead if any one of them is undeclared, then runs the callbacks after a morph it did perform.
A package that #imports another package now contributes that package's declared css_stylesheet and js_scripts too, so a shared helper package works by being depended on rather than by every consuming project repeating the import. The asset scan walks the imported packages breadth-first from the project's own imports until no new ones appear. Specs a project imports directly keep their position ahead of anything reached only through a package, because injection order is script execution order on the page. An import cycle terminates, and a spec that resolves to no package is skipped rather than failing a build that would otherwise have succeeded.
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See changelog.md.