[msmps]

Summary

• update Core, React, and Solid templates to OpenTUI 0.8.1
• update React to 19.3.1 and Solid to 1.9.18
• align Bun requirements and types with current OpenTUI runtime guidance
• regenerate all Bun lockfiles with Bun 1.4.4
• await Solid initial rendering so startup errors are observable
• link generated READMEs to the current runtime support documentation

Verification

• frozen installs and typechecks passed for all templates with Bun 1.4.4
• frozen installs and typechecks passed for all templates at the documented minimum, Bun 1.3.14
• all templates launched in a pseudo-terminal, rendered the expected prompt, and exited cleanly on Ctrl+C
• repository check, 61 tests, and build passed
• npm advisory audit reports zero vulnerabilities for Core and React

Upstream advisory

@opentui/solid@0.8.1 currently pulls glob@9.3.5 through babel-plugin-module-resolver@5.0.2. npm reports four moderate advisories in that upstream build-time dependency path. There is no compatible upstream release to select, so this PR does not add a potentially breaking transitive override.