Force UTF-8 stdout so validate-schema hook doesn't crash on Windows (cp1252)

[voipcomjohn]

Problem

On Windows the console defaults to cp1252, which can't encode the status emoji (U+1F6D1 and U+26A0) that hooks/validate-schema.py prints when it finds schema issues. The moment the validator detects a placeholder or a deprecated @type in an HTML file's JSON-LD, it crashes:

UnicodeEncodeError: 'charmap' codec can't encode character '\U0001f6d1' in position 0: character maps to <undefined>

So on Windows the PostToolUse hook exits 1 with a traceback exactly when it should be cleanly blocking the edit (exit 2), and the findings never reach the user. Every Write/Edit that trips the emoji path fails this way.

Fix

Reconfigure stdout/stderr to UTF-8 at the top of main(), guarded in try/except so it's a harmless no-op on streams that don't support it. No other behavior change.

Testing

Windows 11 + Python 3.12, against an HTML file whose JSON-LD contains [Business Name], [Phone], and @type: HowTo.

Before: UnicodeEncodeError, exit 1.

After (exit 2, cleanly blocking):

Schema validation ERRORS (blocking):
  - Block 1: Contains placeholder text: [Business Name]
  - Block 1: Contains placeholder text: [Phone]
  - Block 1: @type 'HowTo' is deprecated September 2023

Clean and non-HTML files still exit 0 silently.

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