feat: add tags CLI command (API parity)

[callumreid]

Summary

Adds the coval tags command to the CLI, bringing it to parity with the /v1/tags API endpoints.

What's New

• coval tags list — list all tags
• coval tags get <id> — get a tag by ID
• coval tags create --tag-name <name> [--color <hex>] — create a tag
• coval tags update <id> [--tag-name <name>] [--color <hex>] — update a tag
• coval tags delete <id> — delete a tag

Files Changed

• src/client/models/tag.rs — Tag model with Tabular impl, request/response structs
• src/commands/tags.rs — TagCommands with full CRUD
• src/client/mod.rs — TagsClient with list/get/create/update/delete
• src/client/models/mod.rs — registered tag module
• src/commands/mod.rs — registered tags module
• src/cli.rs — wired Tags command

Verification

All operations tested against Coval API (cal-demo org):

$ coval tags create --tag-name cli-test --color "#FF0000"
# → {"id":"jMA83h8YNfLmYQoTMEk54T","tag_name":"cli-test","color":"#FF0000"}

$ coval tags get jMA83h8YNfLmYQoTMEk54T
# → Returns tag JSON

$ coval tags update jMA83h8YNfLmYQoTMEk54T --color "#00FF00"
# → {"color":"#00FF00"}

$ coval tags list
# → Table with 80+ tags shown

$ coval tags delete jMA83h8YNfLmYQoTMEk54T
# → "Tag deleted."

• cargo build — passes
• cargo clippy — clean
• cargo test — 90/90 pass

Greptile Summary

This PR adds a coval tags command that brings the CLI to parity with the /v1/tags REST API, implementing full CRUD operations (list, get, create, update, delete) following the same structure used by every other resource command in the codebase.

• New files: src/client/models/tag.rs defines the Tag model with a Tabular impl (all five fields rendered in the table), plus request/response structs. src/commands/tags.rs implements TagCommands with the input_json pattern shared across the project.
• Wiring: src/client/mod.rs gains TagsClient, and src/cli.rs / src/commands/mod.rs / src/client/models/mod.rs are updated to register the new module — all consistent with how prior resource commands were added.
• Validation: The update path correctly guards against a no-op empty PATCH with anyhow::ensure!(!input.is_empty(), …), and .worktrees/ has been added to .gitignore.

Confidence Score: 5/5

Safe to merge — the changes are additive and follow established patterns throughout the codebase.

The new tags command is a straightforward structural addition that mirrors how every other resource command is wired in this project. The client methods, model structs, and command dispatch all follow the existing conventions exactly. The update path has an explicit guard against empty PATCH bodies, .worktrees/ is now gitignored, and the Tag model's Tabular impl exposes all five fields. No logic was changed in existing paths.

No files require special attention.

_{Reviews (3): Last reviewed commit: "fix: address review comments" | Re-trigger Greptile}

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📥 Commits

Reviewing files that changed from the base of the PR and between 61d1d1d and 17399f7.

📒 Files selected for processing (7)

• .gitignore
• src/cli.rs
• src/client/mod.rs
• src/client/models/mod.rs
• src/client/models/tag.rs
• src/commands/mod.rs
• src/commands/tags.rs

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_{Comment @coderabbitai help to get the list of available commands.}

[callumreid]

🟢

[borgesius]

Looks reasonable. The tags client/commands line up with the v1 API shape and the update guard prevents empty PATCHes.