feat(cli): add claw hook list command

Expose registered runtime and plugin hook entries through a direct claw hook list command and cover the new surface with CLI, help, and report tests.

Constraint: Reuse the existing runtime/plugin configuration plumbing without introducing a separate hook registry
Rejected: Hide the feature behind the REPL-only /hooks slash command | the request requires a direct top-level CLI command
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep the hook list output aligned with config-loaded hooks plus plugin enabled state when hook sources change
Tested: cd rust && cargo build --workspace
Tested: cd rust && cargo test --workspace
Tested: cd rust && cargo run -q -p rusty-claude-cli --bin claw -- hook list
Not-tested: Remote push/CI after publishing the branch

Author: Yeachan-Heo