feat(tui): ship TUI in default binary

[serrrfirat]

Summary

• Add tui to default Cargo features so the Ratatui terminal UI ships in standard builds
• Remove dist = false from ironclaw_tui so cargo-dist includes it in release artifacts

The TUI only activates when explicitly configured at runtime (config.channels.tui.is_some()), so server/Docker deployments are completely unaffected — the deps compile in but nothing initializes. The dependency footprint is light (ratatui, crossterm, tui-textarea, pulldown-cmark, arboard, image/png).

Server builds that want to exclude it can still use --no-default-features --features postgres,libsql.

Test plan

• cargo check with default features — compiles clean
• cargo check --no-default-features --features postgres,libsql — compiles clean without TUI
• CI passes

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request updates the main Cargo.toml to include the tui feature in the default features, and removes the [package.metadata.dist] section from crates/ironclaw_tui/Cargo.toml. The reviewer noted that making tui a default feature introduces a dependency (arboard) that requires X11/Wayland development headers on Linux, which could lead to build failures in minimal environments like Docker or CI. The reviewer suggests considering making the TUI feature optional or making arboard an optional dependency within ironclaw_tui to ensure portability for default builds, given the project's target deployment environments.

[serrrfirat]

Addressed review feedback: arboard and image are now optional deps behind a clipboard feature in ironclaw_tui (defaulted on). Headless/Docker builds that omit the tui feature won't pull in the X11/Wayland dependency chain. When clipboard is disabled, copy-to-clipboard is a no-op and image paste returns None.

[Copilot]

Pull request overview

This PR makes IronClaw’s Ratatui-based TUI ship in standard builds by enabling the tui feature by default, and it introduces a clipboard feature in ironclaw_tui to optionally compile clipboard/image support.

Changes:

• Enable the workspace/root crate’s tui feature in the default feature set.
• Add clipboard as an ironclaw_tui feature (enabled by default) and make arboard/image optional deps behind it.
• Gate clipboard-related functions/tests in the TUI app code behind cfg(feature = "clipboard").

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
Cargo.toml	Adds tui to default features so the TUI is included in standard builds.
crates/ironclaw_tui/Cargo.toml	Introduces clipboard feature and makes arboard/image optional behind it.
crates/ironclaw_tui/src/app.rs	Adds cfg(feature="clipboard") gating with non-clipboard fallbacks for clipboard text/image helpers and related tests.

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