[docs] Expand the fresh-agent recovery walkthrough into a complete sample

[Seven128]

The first before/after walkthrough now exists at docs/examples/fresh-agent-recovery.md.

Use this issue to expand it into a more complete sample repository or richer walkthrough.

Acceptance signals:

• Includes a before/after view of the generated files.
• Shows where durable facts belong: project_context/global.md, architecture.md, context.toml, area Context and verification role Context.
• Demonstrates make validate-context or the equivalent CLI validation path.
• Shows one fresh-agent recovery prompt and a useful first answer.
• Keeps product quality claims separate from Context recoverability.
• Does not claim benchmark speedups or external adoption unless backed by fresh evidence.

Candidate formats:

• Extend docs/examples/fresh-agent-recovery.md with a small code fixture.
• Add a separate public example repo.
• Add screenshots or a short clip using the current demo assets.

Current state:

• project-tiny-context-harness@0.2.41 is published on npm.
• The renamed repository and README surfaces are live.
• This issue is no longer blocking broad launch; it is a follow-up for richer examples after first launch feedback.