Test space consistency and unused states

[matt852]

This PR adds a new pytest file with a few new checks:

• test_template_compiles - Tests that all submitted templates successfully compile.
• test_rule_indentation - TextFSM compiles with 1 space, 2 spaces, or a tab. This rule enforces 2 spaces as a standard.
• test_no_unused_states - Verifies that every defined state is reachable from another rule.

Additionally, this PR cleans up multiple files not currently using the standard 2 spaces, as well as ones that have unreachable "Done" states at the end of them.

[claude]

Claude Code Review

This repository is configured for manual code reviews. Comment @claude review for a one-time review, or @claude review always to subscribe this PR to a review on every future push.

_{Tip: disable this comment in your organization's Code Review settings.}