[issue #6] Implement trusted configuration loading

[Saber5656]

Summary

• add typed two-level global and project configuration loading with field-level overrides
• validate untrusted TOML values, size limits, resource settings, paths, and hardening-adjacent keys
• require path-and-content-bound approval for project configuration and fail closed in non-interactive mode
• reject symlink and special-file configuration inputs, including nonblocking FIFO handling on Unix
• document a safe example configuration

Validation

• cargo fmt --all -- --check
• cargo test --all-features --locked (17 unit tests, 1 integration test)
• cargo clippy --all-targets --all-features --locked -- -D warnings
• git diff --check
• scoped secret scan
• independent tech-security review: quality_ok, security_clear

Closes #6

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a8fb326f-9282-4d2c-b040-700f8f21b0b8

📥 Commits

Reviewing files that changed from the base of the PR and between 8c09dc2 and 2c1886b.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (4)

• Cargo.toml
• cage.toml.example
• src/config/loader.rs
• src/config/mod.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-6-config-loader

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