Remove stale docs tree

[alessiodevoto]

Summary

This PR removes the top-level docs/ tree and patches references that pointed at those files. It is stacked on top of #13, the skill cleanup / nooa rename PR.

The rationale is that these docs were already diverging from the current library and only covered parts of the framework. For a first-time user, that partial and sometimes stale documentation makes the project harder to understand rather than easier. The clearer pre-release surface is currently README.md, examples/, AGENTS.md, and the skills/nooa-* files. So my reasoning here was to keep them as a source of truth.

This is just one option. If we prefer to keep public docs and invest in updating them instead, we can close this PR.

Changes

• Remove the stale docs/ tree
• Redirect AGENTS.md toward skills/nooa-agent-authoring/SKILL.md
• Remove or update broken/stale docs/ references in skills, memory package docs/docstrings, and old test/source comments
• Leave external docs URLs and intentional sample strings like file:docs/spec.md untouched

Validation

• uv run ruff check .
• uv run ruff format --check .
• Loaded all 13 skills with TextSkill

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