docs: use npx @tanstack/intent for all CLI references

[KyleAMathews]

Summary

Updates all CLI command references in the README from bare intent to npx @tanstack/intent. Users rarely install global packages — showing the npx form means copy-paste works immediately.

Approach

Straightforward find-and-replace across two sections:

• "Keeping skills current" prose — two inline code references
• "CLI Commands" table — all 8 command rows

The Quick Start section already used the npx form and needed no changes.

Key Invariants

Every CLI command shown in the README uses npx @tanstack/intent so users can copy-paste directly without a global install.

Non-goals

• Did not change any source code or CLI behavior
• Did not update other docs outside the README

Verification

Visual review only — no code changes.

Files changed

• packages/intent/README.md — Updated inline references and CLI Commands table to use npx @tanstack/intent

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commit: d097a66