[API-234] Add runs update command for modifying tags

[lorenjphillips]

Summary

• Adds coval runs update <run-id> --tags foo,bar — PATCHes /v1/runs/{id} (backend API-230).
• Tags are full-replacement (mirrors API). --tags "" clears all tags.
• Bumps version to 0.3.10.

Test plan

• cargo test (33 passed)
• cargo clippy -- -D warnings clean
• cargo fmt --check clean
• New integration test: test_runs_update_tags asserts PATCH is issued and response is rendered

Summary by CodeRabbit

• New Features
  • Added ability to update run tags through a new CLI command.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

A new feature to update run tags is implemented. A RunsClient::update method is added to issue PATCH requests to /v1/runs/{id}. Corresponding request and response model types are introduced. A CLI subcommand runs update is added to accept run IDs and comma-delimited tags. An integration test validates the end-to-end functionality.

Changes

Cohort / File(s)	Summary
Version Management Cargo.toml	Incremented crate version from 0.3.9 to 0.3.10.
API Client & Models src/client/mod.rs, src/client/models/run.rs	Added RunsClient::update method for PATCH requests to /v1/runs/{id}, plus UpdateRunRequest and UpdateRunResponse model structs for serialization and deserialization.
CLI Command src/commands/runs.rs	Added RunCommands::Update variant and UpdateArgs struct to support runs update <run_id> --tags <tags> command with tag normalization.
Test Coverage tests/cli_tests.rs	Added test_runs_update_tags integration test validating the CLI command with mocked API endpoint and tag assertions.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Poem

🐰 A little hop to update those tags so fine,
PATCH requests dance in a line,
CLI commands now can play,
Tags updated every day!
coval hops with glee—feature complete! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a new runs update command for modifying tags, which is the primary feature implemented across the codebase changes.
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.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/runs-update-tags

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