Prepare release 4.6.0 — fix merge conflict, bump version.props 4.5.0 → 4.6.0

- Fix merge conflict in RELEASE_NOTES.md (4.6.0 section had unresolved
  conflict markers from concurrent PRs #261 and #264 merging into main)
- Bump version.props from 4.5.0 to 4.6.0 to cover all unreleased additions
  merged since the 4.5.0 version bump:
  - PR #261: findIndex, tryFindIndex, findIndexAsync, tryFindIndexAsync, sortWith
  - PR #264: isEmpty, tryHead, except

All 287 tests pass.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

RELEASE_NOTES.md

@@ -1,16 +1,13 @@
 ### 4.6.0
 
-<<<<<<< repo-assist/improve-isempty-tryhead-except-2471744-646c6897389cdfcb
 * Added `AsyncSeq.isEmpty` — returns `true` if the sequence contains no elements; short-circuits after the first element, mirroring `Seq.isEmpty`.
 * Added `AsyncSeq.tryHead` — returns the first element as `option`, or `None` if the sequence is empty, mirroring `Seq.tryHead` (equivalent to the existing `AsyncSeq.tryFirst`).
 * Added `AsyncSeq.except` — returns a new sequence excluding all elements present in a given collection, mirroring `Seq.except`.
-=======
 * Added `AsyncSeq.findIndex` — returns the index of the first element satisfying a predicate; raises `KeyNotFoundException` if no match, mirroring `Seq.findIndex`.
 * Added `AsyncSeq.tryFindIndex` — returns the index of the first element satisfying a predicate as `option`, or `None` if not found, mirroring `Seq.tryFindIndex`.
 * Added `AsyncSeq.findIndexAsync` — async-predicate variant of `AsyncSeq.findIndex`; raises `KeyNotFoundException` if no match.
 * Added `AsyncSeq.tryFindIndexAsync` — async-predicate variant of `AsyncSeq.tryFindIndex`; returns `option`.
 * Added `AsyncSeq.sortWith` — sorts the sequence using a custom comparison function, returning an array, mirroring `Seq.sortWith`.
->>>>>>> main
 
 ### 4.5.0
 

version.props

@@ -1,5 +1,5 @@
 <Project>
   <PropertyGroup>
-    <Version>4.5.0</Version>
+    <Version>4.6.0</Version>
   </PropertyGroup>
 </Project>