Specify case sensitivity for aliases and modifiers in drafts (OCPS 1.1 and 1.3)

[Copilot]

The specification lacked explicit case sensitivity requirements for aliases (nicknames) and letter-based modifiers (L, W).

Changes

• OCPS-increment-1.1.md: Nicknames now MUST be treated as case-sensitive (previously case-insensitive)
• OCPS-increment-1.3.md: Added section-level statement that L and W modifiers MUST be treated as case-sensitive

Not Changed

• OCPS-1.0.md: Already correctly specifies month/day names as case-insensitive (these are field values, not modifiers)
• OCPS-increment-1.4.md: The + and ? characters are symbols without case variants

Original prompt

ensure that aliases and modifiers is specified as case sensitive in spec and drafts

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