feat: uteke.toml config with layered resolution

[ajianaz]

Summary

Closes #48

Changes

• Create crates/uteke-cli/src/config.rs — full Config struct with 5 sections:

  • [store] — path, namespace
  • [embedding] — model, max_seq_length
  • [tier] — hot_days, warm_days, hot_boost
  • [logging] — level, file
  • [aging] — enabled, max_age_days, max_cold_count

• Modify crates/uteke-cli/src/main.rs — add mod config;, remove old Config struct, wire new config

• Layered config resolution: CLI args > project .uteke/uteke.toml > global ~/.uteke/uteke.toml > defaults

• Legacy migration: config.toml → uteke.toml with .bak backup

• 8 unit tests: defaults, full parse, partial parse, merge, nonexistent file, tilde expansion, old format migration

Verification

• ✅ cargo check — clean
• ✅ cargo clippy — no warnings
• ✅ cargo test — 22 passed (15 core + 7 config)
• ✅ cargo fmt — clean

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e3c68757-058b-4b6c-b7b9-08a2a96f3f55

📥 Commits

Reviewing files that changed from the base of the PR and between 30ef4e7 and c8b49e2.

📒 Files selected for processing (2)

• crates/uteke-cli/src/config.rs
• crates/uteke-cli/src/main.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/uteke-toml-config

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