feat: enforce WASI reactor mode

[mattjohnsonpint]

All Modus apps are technically implemented as WASI "reactor" modules - which should use _initialize as their internal wasm start function. _start should be used only for WASI "command" modules.

This PR updates Modus to enforce this part of the WASI spec. As a side effect, the minimum version of TinyGo for the Modus Go SDK is now increased to v0.35.0.

[linear]

HYP-3420 Enforce WASI reactor mode

[Copilot]

Pull Request Overview

This PR enforces the use of the WASI reactor module mode by switching the start function from _start to _initialize and updating the required TinyGo version.

• Bump the minimum TinyGo version from 0.33.0 to 0.35.0 across the build system and CLI globals.
• Remove the TinyGo version check in the build process and unconditionally use reactor mode flags.
• Update module configuration and plugin setup to dynamically select the proper WASI startup function based on module exports.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sdk/go/tools/modus-go-build/compiler/compiler.go	Updates version constant and removes conditional TinyGo version check to enforce reactor mode.
sdk/assemblyscript/src/plugin.asconfig.json	Changes the exported start function from _start to _initialize.
runtime/wasmhost/wasmhost.go	Adapts getModuleConfig usage to include the plugin information and update start functions.
runtime/plugins/plugins.go	Introduces a StartFunction field and conditionally selects the appropriate start function.
cli/src/custom/globals.ts	Updates the minimum TinyGo version in CLI globals.
CHANGELOG.md	Adds an entry for the new WASI reactor mode enforcement feature.

Comments suppressed due to low confidence (1)

sdk/go/tools/modus-go-build/compiler/compiler.go:27

• The TinyGo version check is removed; consider removing the getCompilerVersion helper and its associated error handling to simplify the build process.

tinygoVersion, err := getCompilerVersion(config)

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