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0a410f18e5
libghostty-vt already parses OSC 52 into the clipboard_contents action but
the stream handler dropped it in the no-effect list, so embedders had no way
to observe a program's clipboard writes. Add a clipboard_set effect following
the existing bell/title_changed pattern and expose it through the C API as
GHOSTTY_TERMINAL_OPT_CLIPBOARD_SET.
The callback receives the OSC 52 kind byte and the base64 payload exactly as
received; decoding and kind interpretation are left to the embedder, matching
how ghostty itself defers decoding to the apprt layer.
Clipboard read requests ("?") are never forwarded: answering one would let
any program running in the terminal silently read the user's clipboard, and
a VT state library cannot mediate that with user consent. Empty payloads are
also ignored rather than inventing clear semantics.