feat: + is annotation flag prefix, allowing new 2-char flags

[hippietrail]

Issues

N/A

Description

All of the mnemonic ASCII annotation flags are pretty much used up.
This PR allows them to be used a second time by prefixing them with +

I also retired newest-dict-changes from the justfile

How Has This Been Tested?

cargo test + manual testing for the harper-cli and justfile changes.

AI Disclosure

• I am a human and didn't use any AI.
• I used LLM features of my editor, but not an agent.
• I consulted one or more coding AIs, but didn't use an agent.
• I used an AI agent interactively.
• I am an agent or I got an agent to do the work autonomously.

Checklist

• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have considered splitting this into smaller pull requests.