chore: release v0.19.0

[Alex793x]

🤖 New release

• syncable-cli: 0.18.6 -> 0.19.0 (⚠ API breaking changes)

⚠ syncable-cli breaking changes

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.45.0/src/lints/enum_variant_added.ron

Failed in:
  variant Commands:Chat in /tmp/.tmpg8kJMb/syncable-cli/src/cli.rs:234

Changelog

0.19.0 - 2025-12-16

Added

• Add AI agent layer with Rig framework and harden framework detection

Other

• Merge pull request Develop #185 from syncable-dev/develop

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