* fix: add missing build.sh for Discord and WhatsApp channels (#406)
Both channels had full source code in channels-src/ but no build.sh,
so their WASM binaries were never compiled and they didn't appear in
the setup wizard's channel selection list.
Modeled after the existing channels-src/telegram/build.sh.
Co-Authored-By: Claude Opus 4.6 <[email protected]>
* fix: guard wasm-tools availability in WASM build scripts
Add command existence check before invoking wasm-tools in discord
and whatsapp build scripts. Prints actionable error message if missing.
Addresses Gemini review feedback on PR #429.
Co-Authored-By: Claude Opus 4.6 <[email protected]>
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Co-authored-by: Claude Opus 4.6 <[email protected]>
