dangernoodle-io / breadboard / 30511589504

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feat: add out= to the bbtool:init grammar for out-parameter handles (#1143)

- out= declares a manifest-only out-parameter handle (rejected as a hard
  WireError on a component-header marker); codegen emits one file-scope
  static <c-type> <varname>; declaration per resolved entry, grouped with
  the bb_app_avail_* preamble block
- reserve codegen's own bb_app_ prefix (case-sensitive) plus the
  BB_APP_INIT_TAG macro name as a hard WireError -- an out= varname
  colliding with a generated identifier (bb_app_http_handle, bb_app_rc,
  bb_app_first_err, bb_app_avail_<token>) would otherwise either shadow a
  generated local silently or duplicate-define a file-scope declaration
- two entries declaring the same out= varname is a hard WireError naming
  both
- test_out_empty_value_is_error / test_duplicate_out_key_is_error are
  deliberate mirror tests of the pre-existing generic tokenizer checks
  (empty value, duplicate key), kept for documentation/consistency even
  though they'd pass without out='s own :-splitting logic

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