docs: reposition as 'knowledge manager' instead of 'scratchpad'

[VariableThe]

Aligns public-facing descriptions with the app's actual feature set. PaperCache has persistent folders, internal linking, a knowledge graph, tags, global variables, tasks, reminders, and AI context injection — far beyond a transient scratchpad.

Changes

• README.md: tagline scratchpad → knowledge manager
• llms.txt: tagline scratchpad → knowledge manager
• PHILOSOPHY.md: updated both references to reflect the terminology

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 30def366-ae22-4bca-9679-679af9f40114

📥 Commits

Reviewing files that changed from the base of the PR and between cfeecd6 and 9671e48.

📒 Files selected for processing (3)

• PHILOSOPHY.md
• README.md
• llms.txt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/knowledge-manager-tagline

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