Fix Lesson 6 documentation accuracy and document Agents/Skills

[Copilot]

Line number references throughout Lesson 6 were out of sync with demo_buggy.cpp. Additionally, skill names referenced a non-existent "odrive-qa-assistant" skill, and the lesson lacked documentation of the Agents/Skills available in the repo.

Line Number Corrections

All files updated to match actual positions in demo_buggy.cpp:

Bug	Before	After
FaultLogger (circular buffer)	29-37	31-38
Encoder (race condition)	63-80	65-81
SpeedCalculator (overflow)	96-106	104-111

Files: readme.md, slides.md, demo-script.md, hands-on-exercises.md

Skill Name Corrections

• odrive-qa-assistant → cpp-testing (test generation)
• Added odrive-toolchain reference for build operations

Added Agents & Skills Documentation

New section in readme.md documenting:

• 6 agents: ODrive-Engineer, ODrive-QA, ODrive-Reviewer, ODrive-Toolchain, ODrive-Ops, ada-to-cpp-migrator
• 9 skills with production/planned status
• Decision tree for agent selection

Original prompt

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This section details on the original issue you should resolve

<issue_title>Lesson 6 review</issue_title>
<issue_description>Review Lesson 6 for accuracy. Examine all files and be sure they are correct. Also not the new Agents and Skills in this repo. Propose any changes which will improve the lesson</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Lesson 6 review #12

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