docs: expand context7 rules — VyOS-specific LLM guardrails

Add 5 rules to `context7.json` targeting recurring LLM mistakes when
answering VyOS questions through the context7-served index:

1. `commit` vs `save` semantics + verification step. Most common
   mistake: forgetting that `set/delete` are staged-only, that
   `commit` runs validation (failure = no change), and that `save`
   is a separate persistence step.
2. Image-based, not package-managed. Stops `apt install <pkg>`
   recommendations. Upgrade is `add system image <url>` then
   `set system image default-boot <name>`.
3. No raw Linux commands for configuration (`ip`, `iptables`,
   `systemctl`, NetworkManager). They bypass the CLI and do not
   persist.
4. CLI quoting with single quotes for whitespace/special chars +
   hierarchical-path reminder (paths under a parent extend without
   re-stating it).
5. Routing protocols are FRR-backed but only the VyOS-CLI-exposed
   subset is valid. Synthesizing from FRR docs produces invalid
   VyOS commands. Reinforces existing rule 5 with the most common
   synthesis trap.

Each rule fits the 255-char per-rule limit. Total now 11 of 50.

Lower-priority candidates intentionally omitted (low LLM-mistake
yield): `compare`/`discard`/`rollback` mechanics, interface naming
conventions, `commit-confirm`, `load`/`merge`, Equuleus EOL
status — already implicit in the version-branches rule.

🤖 Generated by [robots](https://vyos.io)

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