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add ArgumentStyle field to Flag to control accepted argument variants (#29)

* add ArgumentStyle field to Flag to control accepted argument variants

Add a new ArgumentStyle field to the Flag struct that allows controlling
which flag argument variants are accepted: next argument (-f arg), delimiter
attached (-f=arg), or directly attached (-farg). Default is AnyArgumentStyle
which accepts all variants.

This is useful for commands that require the argument to be attached to the
flag and only accept that variant.

Assisted-by: Crush:minimax-m2.7

* change ArgumentStyle from enum to bitmask for flexible combination

ArgumentStyle is now a uint bitmask instead of an enum, allowing
flexible combinations like AcceptDelimited | AcceptNext.
Zero value (default) accepts all variants.

Assisted-by: Crush:minimax-m2.7

* added methods

* embed ArgumentStyle

* add AGENTS.md documenting repo for agents

Covers build/test/lint commands, the per-type method matrix,
fork-specific Flag extensions (Mode, Nargs, OptargDelimiter,
ArgumentStyle), structured errors, testing conventions, and
gotchas like the spf13/pflag module path and value-type encoding
differences.

Assisted-by: Crush:glm-5.2

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Co-authored-by: rsteube-bot <rsteube-bot@users.noreply.github.com>

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