docs: fix inaccuracies in README component table and architecture section

[peteski22]

Summary

• Plugin release tag prefix: N/A → plugin/X.Y.Z (tags like plugin/0.13.0 exist)
• CLI published name: github.com/mozilla-ai/cq/cli (Go module path) → cq with Homebrew tap name, matching what users actually type to install
• Architecture section: removed internal dependency name (mcp-go) — meaningless to readers and couples docs to an implementation detail

Summary by CodeRabbit

Documentation

• Updated Plugin component release tag prefix information in the published components table.
• Refined architecture documentation for improved clarity on local server configuration and operation.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 4da5a862-54f4-4f66-92ba-f3c023b0c349

📥 Commits

Reviewing files that changed from the base of the PR and between 066fb78 and 06ac54d.

📒 Files selected for processing (1)

• README.md

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Walkthrough

Two corrections are made to README.md: the Plugin (Claude Code) entry in the published components table has its "Release tag prefix" updated from N/A to plugin/X.Y.Z, and the Local MCP server architecture bullet removes the explicit mcp-go CLI identifier from its description.

Changes

README Documentation Corrections

Layer / File(s)	Summary
Published components table and architecture bullet README.md	The Plugin (Claude Code) row's "Release tag prefix" changes from N/A to plugin/X.Y.Z, and the Local MCP server architecture bullet removes the explicit mcp-go CLI name from its description.

Possibly related PRs

• mozilla-ai/cq#441: Adds a plugin/ component tag prefix in scripts/prepare_gitbook_site.py, directly corresponding to the plugin/X.Y.Z release tag prefix now documented for the Plugin (Claude Code) row in this PR.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/readme-accuracy

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