Add upper limit of max window size and packet size, Add unit tests

[yosuke-wolfssl]

This PR adds following things:

• Adds upper bounds for maximum window size and packet size to harden wolfSSH_CTX_SetWindowPacketSize.
• Adds unit tests to exercise it.

Addressed by f_5572

[Copilot]

Pull request overview

This PR hardens wolfSSH_CTX_SetWindowPacketSize() by introducing compile-time upper bounds for accepted window and packet sizes, and adds a unit test to validate the new behavior.

Changes:

• Added WINDOW_SZ_UPPER_BOUND and MAX_PACKET_SZ_UPPER_BOUND constants.
• Enforced the new upper bounds in wolfSSH_CTX_SetWindowPacketSize().
• Added an API unit test covering defaulting behavior and boundary/overflow cases.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
wolfssh/internal.h	Defines upper-bound macros for window and packet size accepted by wolfSSH_CTX_SetWindowPacketSize().
src/ssh.c	Adds validation logic to reject window/packet sizes above the configured upper bounds.
tests/api.c	Adds a unit test for wolfSSH_CTX_SetWindowPacketSize() covering defaults and upper-bound checks.

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[wolfSSL-Fenrir-bot]

Fenrir Automated Review — PR #995

Scan targets checked: wolfssh-bugs, wolfssh-src

Findings: 1
1 finding(s) posted as inline comments (see file-level comments below)

This review was generated automatically by Fenrir. Findings are non-blocking.