The question pertains to a recent addition to the Indian Navy's fleet, which was introduced to enhance its anti-submarine warfare and coastal defense capabilities. Given the options, we need to identify which warship was commissioned in November 2025 for this purpose.

Let's go through the options one by one:

1. INS Mahe: Reports and current affairs data suggest that INS Mahe was indeed the warship commissioned by the Indian Navy in November 2025. This addition aims to bolster coastal and anti-submarine defense capabilities, emphasizing the strategic significance this vessel holds in the Indian maritime forces.
2. INS Ikshak: Although a crucial part of the navy, INS Ikshak doesn't match the specific timeline and purpose discussed here. It likely refers to a different timeline or context.
3. INS Arnala: INS Arnala is often associated with another class or operation but was not the vessel commissioned in November 2025.
4. INS Vikrant: INS Vikrant is an aircraft carrier that was commissioned earlier and not in November 2025. Therefore, it doesn't fit the criteria of a new commission meant for anti-submarine warfare.

From the analysis above, INS Mahe clearly emerges as the newly commissioned vessel by the Indian Navy in November 2025, aiming to enhance anti-submarine capabilities. Thus, the correct answer is option 1, INS Mahe.