feat(arty): introduce runtime facade and core crates

[martintmk]

Introduces the initial arty runtime facade and intentionally empty arty_core foundation at version 0.2.0. arty re-exports thread-awareness types through arty::core and exposes selected Tick primitives through independent time and test-util features. It also adds minimal design, I/O, panic-safety, and stabilization policies plus feature-surface tests.

[github-actions]

✅ Version increments look sufficient

cargo semver-checks compared the 2 crate(s) this PR publishes against their previous version-bump commit in git history. Every version increment is sufficient for the detected API changes.

Crate	Baseline	Baseline commit	This PR	Minimum required	Status
arty	new crate	—	0.2.0	0.2.0	✅ ok
arty_core	new crate	—	0.2.0	0.2.0	✅ ok

This check is informational and does not block the merge.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (a312e8b) to head (876a753).

Additional details and impacted files

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  Coverage   100.0%   100.0%           
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  Files         583      583           
  Lines       62930    62930           
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  Hits        62930    62930           

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[Copilot]

🟡 Changes recommended

The new public-surface test uses size_of without bringing it into scope, and should be adjusted to avoid relying on implicit availability.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Introduces the initial arty runtime facade crate and an intentionally empty arty_core foundation crate, establishing a small, feature-gated public surface that primarily re-exports existing workspace primitives.

Changes:

• Added arty and arty_core crates at 0.2.0, including crate docs and packaging/metadata setup.
• Implemented arty as a facade re-exporting thread_aware_core under arty::core and selected tick types behind time / test-util features.
• Added public-surface tests to validate the feature-gated facade.

File summaries

File	Description
crates/arty/tests/public_surface.rs	Adds compile-time surface checks for feature-gated re-exports.
crates/arty/src/lib.rs	Defines the arty facade modules and feature-gated re-exports.
crates/arty/README.md	Adds generated crate README describing features and policies.
crates/arty/docs/STABILIZATION.md	Documents stabilization policy for re-exported dependencies.
crates/arty/docs/PANICS.md	Documents panic/unwind safety policy expectations.
crates/arty/docs/IO.md	Documents I/O ownership/injection policy.
crates/arty/docs/DESIGN.md	Documents high-level design intent.
crates/arty/Cargo.toml	Adds crate metadata, features, deps, and external-types allowlist.
crates/arty_core/src/lib.rs	Introduces empty foundation crate with crate-level docs.
crates/arty_core/README.md	Adds generated README for the foundation crate.
crates/arty_core/Cargo.toml	Adds crate metadata and coverage-gate configuration for empty crate.
Cargo.toml	Registers arty and arty_core in the workspace dependency set.
Cargo.lock	Records new workspace packages in the lockfile.

Review details

• Files reviewed: 12/13 changed files
• Comments generated: 1
• Review effort level: Lite

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