Repair Carapace README version and ARIA link

[ryan10sa-star]

Summary

• update top-level Carapace README version badge and package version text to v0.5.0
• mark v0.4.0 as shipped and add v0.5.0 as current in the roadmap
• replace the broken ARIA Registry link with the live API docs URL

Verification

• gh release list confirms latest release v0.5.0 published 2026-05-23
• curl https://api.relayforge.tools/aria/v1/docs -> 200 text/html
• git diff --check

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[Copilot]

Pull request overview

Updates the top-level repository README to reflect the latest Carapace release and to fix a broken ARIA Registry link, keeping public-facing documentation consistent with the current shipped version.

Changes:

• Updated the ARIA Registry link to the live API docs URL.
• Bumped the README version badge and referenced “canonical package names” text to v0.5.0.
• Updated the roadmap to mark v0.4.0 as shipped and v0.5.0 as current.

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[chatgpt-codex-connector]

Do not advertise v0.5.0 before PyPI is published

This line now tells users that the installable PyPI package corresponds to v0.5.0, but the public PyPI project page for carapace-sdk still reports latest version 0.4.0 with only 0.4.0/0.2.0/0.1.x releases. In the current state, users following pip install carapace-sdk will not get the README's v0.5.0 APIs, so the README should either wait for the package publish or call out that v0.5.0 is source/GitHub-only until PyPI is updated.

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