[nexus] migrate test_reset to Nexus

[jwhui]

Migrate legacy Python test test_reset.py to Nexus C++ test test_reset.cpp.

The test verifies that OpenThread correctly recovers network state, specifically frame counters and datasets, after sequential resets of nodes in a multi-hop topology (Leader <-> Router <-> ED).

The test sequence:

• Establish multi-hop topology: Leader <-> Router <-> ED.
• Send 1010 pings from ED to Leader to advance the frame counter beyond the default storage threshold (1000).
• Reset Leader, Router, and ED sequentially.
• Verify end-to-end connectivity after resets, confirming that frame counters were correctly recovered from non-volatile storage.

Legacy tests/scripts/thread-cert/test_reset.py is removed as its functionality is now fully covered by the Nexus test.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request completes the migration of a legacy Python-based certification test to the C++ Nexus testing framework. The purpose of this change is to improve test performance and maintainability by leveraging the native Nexus environment for verifying network state recovery after node resets.

Highlights

• Test Migration: Migrated the legacy Python test test_reset.py to a new C++ Nexus test test_reset.cpp.
• Test Coverage: The new Nexus test verifies that OpenThread correctly recovers network state, including frame counters and datasets, after sequential node resets in a multi-hop topology.
• Cleanup: Removed the legacy tests/scripts/thread-cert/test_reset.py file as its functionality is now fully covered by the new Nexus test.

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[github-actions]

Merging #12971 into main

name	branch	text	data	bss	total
ot-cli-ftd	5340cfa	483128	860	66548	550536
	ea9a99a	483128	860	66548	550536
	+/-	+0	+0	+0	+0
ot-ncp-ftd	5340cfa	448948	764	61784	511496
	ea9a99a	448948	764	61784	511496
	+/-	+0	+0	+0	+0
ot-cli-mtd	5340cfa	375120	764	50972	426856
	ea9a99a	375120	764	50972	426856
	+/-	+0	+0	+0	+0
ot-ncp-mtd	5340cfa	356180	764	46240	403184
	ea9a99a	356180	764	46240	403184
	+/-	+0	+0	+0	+0
ot-cli-ftd-br	5340cfa	599936	864	136732	737532
	ea9a99a	599936	864	136732	737532
	+/-	+0	+0	+0	+0
ot-rcp	5340cfa	63344	568	20804	84716
	ea9a99a	63344	568	20804	84716
	+/-	+0	+0	+0	+0

Library files

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libopenthread-ftd.a	5340cfa	251171	95	40327	291593
	ea9a99a	251171	95	40327	291593
	+/-	+0	+0	+0	+0
libopenthread-cli-ftd.a	5340cfa	61765	0	8091	69856
	ea9a99a	61765	0	8091	69856
	+/-	+0	+0	+0	+0
libopenthread-ncp-ftd.a	5340cfa	33583	0	5948	39531
	ea9a99a	33583	0	5948	39531
	+/-	+0	+0	+0	+0
libopenthread-mtd.a	5340cfa	169779	0	24783	194562
	ea9a99a	169779	0	24783	194562
	+/-	+0	+0	+0	+0
libopenthread-cli-mtd.a	5340cfa	41462	0	8059	49521
	ea9a99a	41462	0	8059	49521
	+/-	+0	+0	+0	+0
libopenthread-ncp-mtd.a	5340cfa	25807	0	5948	31755
	ea9a99a	25807	0	5948	31755
	+/-	+0	+0	+0	+0
libopenthread-ftd-br.a	5340cfa	368977	99	110471	479547
	ea9a99a	368977	99	110471	479547
	+/-	+0	+0	+0	+0
libopenthread-cli-ftd-br.a	5340cfa	80972	0	8131	89103
	ea9a99a	80972	0	8131	89103
	+/-	+0	+0	+0	+0
libopenthread-rcp.a	5340cfa	9946	0	5060	15006
	ea9a99a	9946	0	5060	15006
	+/-	+0	+0	+0	+0
libopenthread-radio.a	5340cfa	19939	0	238	20177
	ea9a99a	19939	0	238	20177
	+/-	+0	+0	+0	+0

[gemini-code-assist]

Code Review

This pull request replaces the Python-based reset test with a new C++ implementation using the Nexus framework. The test verifies that nodes correctly recover their frame counters from persistent storage after a sequential reset of the Leader, Router, and End Device. Feedback suggests optimizing the kAttachToRouterTime constant to reduce the overall simulation duration while still accounting for router upgrade jitter.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.49%. Comparing base (5340cfa) to head (41dc8ef).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12971      +/-   ##
==========================================
- Coverage   72.68%   71.49%   -1.20%     
==========================================
  Files         697      661      -36     
  Lines      101152    94099    -7053     
==========================================
- Hits        73522    67272    -6250     
+ Misses      27630    26827     -803     

see 250 files with indirect coverage changes

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