docs: document squad config model CLI command

[diberry]

Summary

The squad config model CLI command for model pinning was shipped but has no documentation on the docs site.

Source

• Code PR: feat(cli): add squad config model command for model pinning (#618) bradygaster/squad#628 (closes explicit model picker - aligned to sesson model bradygaster/squad#618)
• Author: Brady Gaster
• Commit: 49a196b2 — feat(cli): add squad config model command for model pinning
• Status: Merged to dev, undocumented

What needs documenting

1. New docs page for squad config model command usage
2. CLI reference entry (if a CLI reference page exists)
3. Model selection guide — how model pinning interacts with per-agent model selection in squad.agent.md (Layer 0 persistent config)

Acceptance criteria

• Docs page explains squad config model command syntax and options
• Examples: set default model, set per-agent override, clear preference
• Cross-links to model-selection.md if it exists
• Navigation entry added
• docs-quality tests pass

Requirements

• Independent PR (single commit, squashed)
• Full team review (Flight + FIDO) before merge

[github-actions]

🏗️ Squad Triage — Flight (Lead)

Issue: #68 — docs: document squad config model CLI command
Assigned to: FIDO (Quality Owner)
Reason: Issue relates to testing/quality work

@copilot evaluation: 🔴 Not suitable — issue involves work outside the coding agent's capability profile.

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[github-actions]

📋 Assigned to DSKY (TUI Engineer)

Issue: #68 — docs: document squad config model CLI command

DSKY will pick this up in the next Copilot session.

For Copilot coding agent: If enabled, this issue will be worked automatically.
Otherwise, start a Copilot session and say:
DSKY, work on issue #68

[github-actions]

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