chore(deploy.sh): fail fast if ansible-playbook not on PATH

[KDwevedi]

Problem

deploy.sh's last step is ansible-playbook -i inventory/hosts.yml … playbook-deploy.yml. If ansible isn't on PATH, the script dies with a bare shell error:

deploy.sh: line 63: ansible-playbook: command not found

No hint as to cause or fix. Hit live during a macOS onboarding: pip3 install --user ansible installs ansible-playbook into the Python user-base bin (~/Library/Python/3.x/bin), which macOS does not add to PATH — pip "succeeds" but the binary is invisible, so the failure looks like a deploy bug rather than a missing prereq.

Fix

Early command -v ansible-playbook guard (right after cd "$SCRIPT_DIR", before any work). On miss: exit 127 with the exact install options (brew / pipx / pip+PATH) and the ansible-playbook --version verify command. No behavior change when ansible is present.

Verified: PATH without ansible → actionable error + exit 127; normal PATH → guard passes silently, deploy proceeds unchanged. bash -n clean.

🤖 Generated with Claude Code

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[KDwevedi]

Superseded by #52 (consolidated Mac bring-up — 16 commits absorbing this PR + 5 others into one canonical path on nairobi). Closing.