Merge branch 'main' into dependency-chore

newsfragments/579.feature.rst

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-Added support for ``Kademlia DHT`` in py-libp2p.

newsfragments/621.feature.rst

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-Limit concurrency in `push_identify_to_peers` to prevent resource congestion under high peer counts.

newsfragments/631.feature.rst

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-Store public key and peer ID in peerstore during handshake
-
-Modified the InsecureTransport class to accept an optional peerstore parameter and updated the handshake process to store the received public key and peer ID in the peerstore when available.
-
-Added test cases to verify:
-1. The peerstore remains unchanged when handshake fails due to peer ID mismatch
-2. The handshake correctly adds a public key to a peer ID that already exists in the peerstore but doesn't have a public key yet

newsfragments/639.feature.rst

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-Fixed several flow-control and concurrency issues in the `YamuxStream` class. Previously, stress-testing revealed that transferring data over `DEFAULT_WINDOW_SIZE` would break the stream due to inconsistent window update handling and lock management. The fixes include:
-
-- Removed sending of window updates during writes to maintain correct flow-control.
-- Added proper timeout handling when releasing and acquiring locks to prevent concurrency errors.
-- Corrected the `read` function to properly handle window updates for both `read_until_EOF` and `read_n_bytes`.
-- Added event logging at `send_window_updates` and `waiting_for_window_updates` for better observability.

newsfragments/649.feature.rst

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-Added support for ``Multicast DNS`` in py-libp2p

newsfragments/678.misc.rst

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-Refactored gossipsub heartbeat logic to use a single helper method `_handle_topic_heartbeat` that handles both fanout and gossip heartbeats.

newsfragments/679.feature.rst

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-Added sparse connect utility function to pubsub test utilities for creating test networks with configurable connectivity.

newsfragments/681.breaking.rst

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-Reordered the arguments to `upgrade_security` to place `is_initiator` before `peer_id`, and made `peer_id` optional.
-This allows the method to reflect the fact that peer identity is not required for inbound connections.

newsfragments/684.misc.rst

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-Uses the `decapsulate` method of the `Multiaddr` class to clean up the observed address.

newsfragments/685.feature.rst

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-Optimized pubsub publishing to send multiple topics in a single message instead of separate messages per topic.

newsfragments/687.feature.rst

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-Optimized pubsub message writing by implementing a write_msg() method that uses pre-allocated buffers and single write operations, improving performance by eliminating separate varint prefix encoding and write operations in FloodSub and GossipSub.

newsfragments/690.feature.rst

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-added peer exchange and backoff logic as part of Gossipsub v1.1 upgrade

newsfragments/696.bugfix.rst

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-Add timeout wrappers in:
-1. multiselect.py: `negotiate` function
-2. multiselect_client.py: `select_one_of` , `query_multistream_command` functions
-to prevent indefinite hangs when a remote peer does not respond.

newsfragments/701.bugfix.rst

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-align stream creation logic with yamux specification

newsfragments/702.bugfix.rst

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-Fixed an issue in `Pubsub` where async validators were not handled reliably under concurrency. Now uses a safe aggregator list for consistent behavior.

newsfragments/707.feature.rst

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-Added comprehensive tests for pubsub connection utility functions to verify degree limits are enforced, excess peers are handled correctly, and edge cases (degree=0, negative values, empty lists) are managed gracefully.

newsfragments/708.performance.rst

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-Added extra tests for identify push concurrency cap under high peer load

newsfragments/746.bugfix.rst

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+Improved type safety in `get_mux()` and `get_protocols()` by returning properly typed values instead
+of `Any`. Also updated `identify.py` and `discovery.py` to handle `None` values safely and
+compare protocols correctly.

newsfragments/749.internal.rst

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+Add comprehensive tests for relay_discovery method in circuit_relay_v2

newsfragments/750.feature.rst

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+Add logic to clear_peerdata method in peerstore