chore: add CODEOWNERS to auto-request reviews

[JacobPEvans-personal]

What is CODEOWNERS?

CODEOWNERS is a GitHub-native file (here at .github/CODEOWNERS) that maps
path patterns → owners. When a pull request changes a file, GitHub looks up
who owns that path and automatically adds them as a requested reviewer. If
the repo later turns on the branch-protection rule "Require review from Code
Owners", those owners' approval also becomes required before merge.

How it works

• One rule per line: <path-pattern> <owner> [<owner> ...].
• Owners are GitHub usernames (@user) or teams (@org/team), and must have
  write access to the repo or GitHub ignores them. (@werd-drew has admin
  access here, so he qualifies.)
• Last match wins. The catch-all * is listed first so it's the weakest
  rule; every more specific rule below it overrides the default for its paths.
• It lives on the default branch (main) to take effect — which is exactly
  what this PR does.

Why use it

• No more guessing who should review — the right person is requested
  automatically, every time, based on what changed.
• It's living documentation of who is responsible for each part of the codebase.
• It scales: ownership can be made more granular per area as the team grows.

What this PR does

Adds .github/CODEOWNERS with @werd-drew as the owner of all code currently
on main. Instead of a single blanket * @werd-drew, the file is broken into
meaningful areas:

Area	Path
Default (catch-all)	*
API client / transports / endpoint factory	/cribl_cli/api/
CLI commands + registry	/cribl_cli/commands/
Auth	/cribl_cli/auth/
Config loading	/cribl_cli/config/
Output formatting	/cribl_cli/output/
Shared utilities	/cribl_cli/utils/
CLI wiring	/cribl_cli/cli.py
Entry point	/bin/
Packaging	/pyproject.toml
Tests	/tests/
Search dashboards	/dashboards/
Docs	/README.md, /CLAUDE.md, /docs/
Repo automation	/.github/

Everyone is @werd-drew today. The split exists so a second reviewer can be
added to just one area later — e.g. change /cribl_cli/api/ to
@werd-drew @someone-else — without affecting the rest.

Test Plan

• Validated against GitHub's CODEOWNERS API: GET /repos/.../codeowners/errors
  returns {"errors":[]} (no syntax or unknown-owner errors).
• No code changes; this is repo governance only.

Optional follow-up (not in this PR)

To make code-owner review required (not just auto-requested), enable
Settings → Branches → main → Require review from Code Owners. Left off for now
so it doesn't block these in-flight PRs.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a GitHub CODEOWNERS file to automatically request reviews from the designated owner(s) based on which paths change in a PR, providing a foundation for future “Require review from Code Owners” branch protection.

Changes:

• Introduces .github/CODEOWNERS with a catch-all rule and more specific path-based ownership rules.
• Splits ownership by meaningful codebase areas (API, commands, auth, config, output, utilities, docs, tests, automation) while currently assigning a single owner to all paths.

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