chore: bump version to 0.4.0

[lorenjphillips]

Summary

• Bumps the CLI package version from 0.3.13 to 0.4.0 for the agent-mode feature stack.
• Updates Cargo.lock to match.

Versioning rationale

• Minor bump because the stack adds a substantial opt-in agent-facing CLI surface: --agent, discovery/context, structured input JSON, local skills, and safety contracts.
• Not a major bump because default human CLI behavior remains backward-compatible and the project is still pre-1.0.
• Not a patch bump because this is more than a bugfix.

Testing

• cargo fmt
• cargo clippy --all-targets -- -D warnings
• cargo test
• cargo build --release
• git diff --check
• target/release/coval --version
• target/release/coval --agent agent manifest | jq -e ' .data.version == "0.4.0" '

Stacked PR 6 of 6. Base is feat/aci-5-coverage-polish. No tag, release, or merge performed.

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[callumreid]

bumpus rumpus