Add a Glossary and link it from CLI --help

[JRS1986]

Problem

CodingScaffold uses domain terms that are scattered across wiki pages and not defined in one place: scaffold artifact, adapter, routing, skill, memory, MCP, persona, orchestration, weak/strong model, agentic change, eval, session trace, policy pack. A new user has to read several wiki pages to translate the CLI output.

Why it matters

This is the cheapest possible win for new-dev usefulness. The terms are not optional — they appear in --help, in doctor output, and in every generated template. A glossary turns the docs from "reference for someone who already knows" into "reference you can read cold".

Proposed approach

1. Add docs/docs/wiki/Glossary.md with one paragraph per term, alphabetical, link to the wiki page that goes deeper.
2. Link the glossary from:
   • the top of the wiki index.md
   • the footer of coding-scaffold --help ("Terms: see https://jrs1986.github.io/CodingScaffold/wiki/Glossary\")
   • the footer of doctor output
3. Add a docs/docs/wiki/_glossary_terms.json or similar machine-readable list, and a small test that asserts every term used in --help or printed by the CLI appears in the glossary.

Acceptance criteria

• Glossary.md exists with at least the terms listed above.
• Linked from index.md and from CLI --help footer.
• CI test fails if a new term shows up in cli.py help strings without a glossary entry.