fix: handle None verification in bootstrap diagnostics

[magarrent]

Problem

Installation fails with:

[ERROR] Codex SEO runtime bootstrap failed.
Traceback (most recent call last):
  File "<string>", line 10, in <module>
AttributeError: 'NoneType' object has no attribute 'get'

Root cause

When verify_environment.py fails or produces non-JSON output, bootstrap_environment.py stores None for the "verification" key in the result dict.

In print_bootstrap_diagnostics (install.sh), this line:

notes = payload.get("verification", {}).get("notes", [])

calls payload.get("verification", {}) which returns None — the {} default only applies when the key is absent, not when it is present with value None. The subsequent .get("notes", []) call on None then raises AttributeError.

Fix

# Before
notes = payload.get("verification", {}).get("notes", [])

# After
notes = (payload.get("verification") or {}).get("notes", [])

Using or {} ensures None falls back to an empty dict regardless of key presence.

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