Chia-Network / chia-blockchain / 23344972292

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checkpoint: into main from release/2.6.1  @ <a class=hub.com/Chia-Network/chia-blockchain/commit/c3364780d48921f7f8036492a94e6f354f73cfd8">c3364780d (#20696)

Source hash: c3364780d48921f7f8036492a94e6f354f73cfd8
Remaining commits: 1

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Touches full node block-ingest and peer discovery paths plus wallet
RPC signing behavior, so mistakes could affect sync/connectivity or
transaction submission, though changes are mostly defensive and covered
by new regression tests.
> 
> **Overview**
> Improves robustness and security hardening across node networking and
block processing. `FullNode.add_prevalidated_blocks()` now returns typed
`Err` values (and logs) when prevalidation fails or `required_iters` is
missing, instead of raising assertions; new regression tests cover these
cases.
> 
> Hardens peer discovery against pathological peer host strings by
bounding host length and rejecting non-IP hosts in `_add_peers_common()`
and `add_peers_neighbour()`, with new tests for oversized/invalid/mixed
hosts.
> 
> Fixes cache eviction for future infusion points by recording TTLs in
`FullNodeStore.add_to_future_ip()` and adds tests ensuring
`clear_old_cache_entries()` evicts stale entries. Also tightens keyring
passphrase cache semantics (empty/cleared treated as missing) with a new
test, ensures data-layer uploader HTTP sessions consistently use
`client_timeout`, fixes an S3 plugin missing `continue` on store-id
mismatch, and disables auto-signing specifically for the wallet RPC
`take_offer` action scope.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
1351f71b3. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

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