fix: regular js stays regular, disallow early return in @ control flow

[leonidaz]

Note

High Risk
This is a breaking semantic change for anyone relying on reactive plain-if guards or return inside @try blocks; compiler output and Solid/Ripple runtime behavior shift in core template lowering paths.

Overview
Aligns template semantics so only @if / @for / @switch / @try lower to template control flow; plain if / loops / switch / try in @{ … } compile like normal function bodies (JSX return → tsrx_element), and return inside @try / @catch / @pending is rejected with the same template-return diagnostic as other @-blocks.

On Ripple, the compiler drops return_guard and related _$_.if wrapping: early return is a real early return, so trailing markup is skipped without guard flags (client/server snapshots updated). Analysis no longer errors on plain loops; break / continue / return rules apply only when the enclosing loop is a @for (metadata.tsrxDirective === 'for').

On Solid, plain guards like if (signal()) return … are no longer lifted to <Show>—they run once at setup; reactive conditionals require @if. @-directives and control flow that can throw still lower reactively. Shared isTemplate*Node helpers move to @tsrx/core for consistent directive detection.

Tests and runtime expectations are updated for the new guard behavior (e.g. Vite Solid: flipping a signal after a plain guard does not swap branches).

^{Reviewed by Cursor Bugbot for commit 0c7cd93. Bugbot is set up for automated code reviews on this repo. Configure here.}

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commit: 0c7cd93