[aw][code health] README project structure diagram shows wrong path for developer docs

[github-actions]

Root Cause

The README (README.md lines 201–220) shows the project structure with docs at the top-level docs/ directory:

cli-tools/
├── docs/
│   ├── plan.md
│   ├── architecture.md
│   ├── changelog.md
│   └── implementation.md
```

The actual layout on disk is:

```
cli-tools/
├── docs/
│   └── changelog.md          ← only this file is here
└── src/
    └── copilot_usage/
        └── docs/             ← the other three files live here
            ├── architecture.md
            ├── changelog.md
            ├── implementation.md
            └── plan.md
```

A contributor following the README to find the architecture or implementation notes would look in the wrong directory.

## Fix

Update the project structure diagram in `README.md` to reflect the real layout:

```
cli-tools/
├── src/
│   └── copilot_usage/
│       ├── cli.py
│       ├── models.py
│       ├── parser.py
│       ├── pricing.py
│       ├── logging_config.py
│       ├── report.py
│       └── docs/             ← developer docs live here
│           ├── architecture.md
│           ├── changelog.md
│           ├── implementation.md
│           └── plan.md
├── docs/
│   └── changelog.md          ← top-level changelog
├── tests/
│   ├── copilot_usage/
│   └── e2e/
├── Makefile
└── pyproject.toml

Testing Requirement

No automated test is needed for a documentation-only fix. Verify manually that the paths shown in the updated diagram match the actual repository layout.

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