[COVAL-4339] Complete CLI agent creation parity

[callumreid]

Summary

• expose every public API-creatable agent type through coval agents create --type
• add flags and input-JSON support for customer agent ID, language, attributes, workflows, and tags
• document a CI-friendly LiveKit creation example
• cover every serialized model type and a full LiveKit create request

Validation

• cargo test --all-targets --all-features (111 tests passed)
• cargo clippy --all-targets --all-features -- -D warnings
• cargo fmt --check
• git diff --check

Tracking

COVAL-4339

Depends on coval-ai/backend#6355 for LiveKit and Pipecat create support.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: 1bcb693c-181f-432f-b7ce-da35fb6c709c

📥 Commits

Reviewing files that changed from the base of the PR and between 1f33658 and 75b0d0e.

📒 Files selected for processing (4)

• README.md
• src/client/models/agent.rs
• src/commands/agents.rs
• tests/cli_tests.rs

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Walkthrough

The agent model adds seven agent types and optional creation fields for customer IDs, language, attributes, workflows, and tags. The CLI exposes these fields and parses JSON arguments with flag-specific errors. The README adds a LiveKit creation example. Tests cover supported agent types, help output, and LiveKit request serialization.

Suggested reviewers: lorenjphillips

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: completing CLI agent creation parity.
Description check	✅ Passed	The description directly explains the CLI, model, documentation, testing, and validation changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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