Improve test coverage and fix typos

[pavel-kirienko]

No description provided.

[Copilot]

Pull request overview

This PR improves test coverage for the libudpard library by adding new test functions across multiple test files, and fixes two typos in source-level comments in udpard.c and updates the docstring for udpard_rx_port_new_stateless in udpard.h to better describe the stateless acceptance behavior.

Changes:

• New intrusive tests for TX path edge cases (capacity failure, spool OOM rollback, refcount retention, deadline comparison, transfer alloc OOM, eject stall, sharing branches)
• New intrusive tests for RX path edge cases (session OOM, session retirement, stateless extent/offset handling, fragment OOM, slot update paths, session update failures, port-free with incomplete transfers, fragment tree update paths)
• New end-to-end tests for stateless single-frame and multi-frame first-frame handling; existing e2e tests updated to use larger payloads and stronger assertions; guard tests extended with additional invalid-argument cases; typo fixes in comments

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/src/test_intrusive_tx.c	Adds 7 new TX-side tests covering OOM, capacity, eject stall, refcount, and sharing branches
tests/src/test_intrusive_rx.c	Adds shared rx_mem_fixture_t helper and 9 new RX-side tests covering OOM, session lifecycle, stateless mode, slot update, and port teardown
tests/src/test_intrusive_misc.c	Adds make_fragment helper and test_misc_helpers covering internal utilities and fragment tree teardown
tests/src/test_intrusive_guards.c	Extends guard tests with null-eject vtable, bad payload memory, tx_poll/tx_free null guards, rx_port_ctor guards, and additional rx_port_push null checks
tests/src/test_e2e_edge.cpp	Adds 3 stateless tests (single-frame, truncation, rejection), enlarges existing payload sizes, strengthens multiframe assertion
tests/src/test_e2e_api.cpp	Enlarges payload size and strengthens assertion to confirm multiframe transfer
libudpard/udpard.h	Updates udpard_rx_port_new_stateless docstring to reflect extent-prefix acceptance
libudpard/udpard.c	Fixes two comment typos ("node"→"note", "of OOM"→"on OOM")

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