Set up Phase 1 workspace crates

[sij411]

Summary

• Convert the root crate into a Cargo workspace
• Add crates/feder-core and crates/feder-vocab
• Share package metadata and lint settings across workspace crates
• Remove the placeholder runtime binary

Closes #4.

Validation

• cargo check
• cargo fmt --check
• mise run check

Summary by CodeRabbit

• Refactor
  • Project reorganized into a workspace structure with separate crates: feder-core and feder-vocab.
  • Consolidated package metadata to workspace level.
  • Removed the main executable entry point.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 00d6525c-7f3c-42cf-8856-6b4790b245ac

📥 Commits

Reviewing files that changed from the base of the PR and between 5a68e4f and 1b4ede1.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (6)

• Cargo.toml
• crates/feder-core/Cargo.toml
• crates/feder-core/src/lib.rs
• crates/feder-vocab/Cargo.toml
• crates/feder-vocab/src/lib.rs
• src/main.rs

💤 Files with no reviewable changes (1)

• src/main.rs

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📝 Walkthrough

Walkthrough

The PR restructures the project from a single Rust package into a workspace containing two library crates. Root Cargo.toml becomes a workspace manifest with centralized metadata and lint rules. New crates/feder-vocab and crates/feder-core member manifests inherit shared configuration. feder-core re-exports feder-vocab as a public module. The old single-package main entry point is removed.

Changes

Workspace and Crate Layout Migration

Layer / File(s)	Summary
Workspace and shared configuration Cargo.toml	Root manifest converted to workspace with member crates (crates/feder-vocab, crates/feder-core) and resolver 3; package metadata (version, edition, license) and lint rules (warnings = "deny", clippy config) moved to workspace-level sections.
Member crate manifests crates/feder-vocab/Cargo.toml, crates/feder-core/Cargo.toml	Both crates inherit metadata from workspace; feder-core declares a local path dependency on feder-vocab; both enable workspace lints via [lints] workspace = true.
Crate module setup and re-export crates/feder-vocab/src/lib.rs, crates/feder-core/src/lib.rs	feder-vocab receives crate-level documentation; feder-core adds documentation and re-exports feder_vocab as vocab (pub use feder_vocab as vocab;), making vocabulary types accessible through the core crate.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 From one monolith, a workspace blooms,
Two crates emerge from Cargo rooms,
Vocab and core now dance as one,
With lints shared wide and work begun! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change—converting the repository into a Cargo workspace with Phase 1 member crates.
Linked Issues check	✅ Passed	The pull request meets all coding requirements: creates a Cargo workspace, adds crates/feder-vocab and crates/feder-core as members, establishes shared workspace metadata, removes the placeholder binary, and validates with cargo check.
Out of Scope Changes check	✅ Passed	All changes align with the linked issue scope. The workspace setup, member crate definitions, and binary removal are within scope; GitHub Actions and runtime crates are excluded as specified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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