fix(func): SUPERTREND's outputs are supertrend and trend

[mario4tier]

TA-Lib C 0.8.1 released SUPERTREND with outputs outSupertrend and outTrend. _func.pxi was generated against a pre-release C that still called them outReal and outInteger, so v0.8.0 shows the old names in two places:

>>> help(talib.SUPERTREND)          # and abstract.pyi
    Outputs:
        real
        integer
>>> abstract.Function('SUPERTREND').output_names
['supertrend', 'trend']             # runtime metadata, already correct

Change

• _func.pxi: regenerated with tools/generate_func.py against the released 0.8.1 header. This changes only SUPERTREND, in its docstring and local variable names.
• abstract.pyi: regenerated with tools/generate_abstract_stub.py. It reads the compiled docstring, so it follows _func.pxi.
• _ta_lib.pxd: the only hand edit. The TA_SUPERTREND declaration now uses the header's parameter names.
• _ta_lib.c: regenerated with Cython 3.3.0 and numpy 2.2.0, the pair that reproduces v0.8.0's _ta_lib.c byte for byte. The diff is the renamed identifiers and the compressed docstring tables.
• CHANGELOG: one [FIX] line under 0.8.1.

Return values, dtypes and argument order are unchanged.

Checks

Built against TA-Lib C v0.8.1 compiled from the v0.8.1 tag:

• pytest tests/: 1696 passed.
• help(talib.SUPERTREND) lists supertrend and trend; talib.SUPERTREND(h, l, c) still returns (float64, int32).
• Regenerating _stream.pxi and stream.pyi produces no diff.
• All 406 declarations shared by _ta_lib.pxd and the 0.8.1 ta_func.h were compared by parameter name. TA_SUPERTREND was the only real mismatch; the others differ only in () vs (void) spelling.

https://claude.ai/code/session_01TuVjx2Q5urdmwi5opzfCp8