Please address the comments from this code review:

## Overall Comments
- In the benchmarking helpers (e.g., generateTestUpdates/generateEntityData in store_endpoints_bench_test.go), the loops use `for d := range numDeployments`/`for e := range numEndpoints`, which won’t compile for an `int`; these should be standard indexed loops like `for d := 0; d < numDeployments; d++ { ... }`.
- The BinaryKey implementation hashes L4Proto as an 8-byte big-endian value even though it appears to be a small enum; you can reduce work and simplify the code by writing a single byte for the protocol instead of 8 bytes.

## Individual Comments

### Comment 1
<location path="pkg/net/endpoint.go" line_range="140-154" />
<code_context>
+	buf[1] = byte(e.IPAndPort.Port)
+	_, _ = h.Write(buf[:2])
+
+	// Hash protocol (big-endian)
+	buf[0] = byte(e.L4Proto >> 56)
+	buf[1] = byte(e.L4Proto >> 48)
+	buf[2] = byte(e.L4Proto >> 40)
+	buf[3] = byte(e.L4Proto >> 32)
+	buf[4] = byte(e.L4Proto >> 24)
+	buf[5] = byte(e.L4Proto >> 16)
+	buf[6] = byte(e.L4Proto >> 8)
+	buf[7] = byte(e.L4Proto)
+	_, _ = h.Write(buf[:8])
+
</code_context>
<issue_to_address>
**suggestion:** Hashing L4Proto as 8 bytes is unnecessary and confusing if it is a small enum-like type.

Given `L4Proto` is used as an enum-like int (see `NumericEndpointCompare`), writing it as 8 bytes with bit shifts is unnecessary—all high bytes will be zero for typical definitions. This adds noise to the hash input and obscures intent. You can just write a single byte instead:

```go
buf[0] = byte(e.L4Proto)
_, _ = h.Write(buf[:1])
```

This preserves hash behavior while keeping the code simpler and more explicit about the field’s size.

```suggestion
	// Hash port (big-endian)
	buf[0] = byte(e.IPAndPort.Port >> 8)
	buf[1] = byte(e.IPAndPort.Port)
	_, _ = h.Write(buf[:2])

	// Hash protocol as a single byte (enum-like)
	buf[0] = byte(e.L4Proto)
	_, _ = h.Write(buf[:1])
```
</issue_to_address>

### Comment 2
<location path="sensor/common/clusterentities/debug.go" line_range="137-140" />
<code_context>
 		}
-		for ep, submap := range e.historicalEndpoints {
-			dbg["historicalEndpoints"][ep.String()] = make(map[string]interface{})
+		for epHash, submap := range e.historicalEndpoints {
+			epKey := fmt.Sprintf("0x%x", epHash)
+			dbg["historicalEndpoints"][epKey] = make(map[string]interface{})
 			for deplID, targetInfoSetMap := range submap {
-				for targetInfo, status := range targetInfoSetMap {
-					dbg["historicalEndpoints"][ep.String()][deplID] = map[string]interface{}{
</code_context>
<issue_to_address>
**suggestion (bug_risk):** Debug output for historicalEndpoints only keeps the last port per deployment.

In the inner loop, `dbg[
</issue_to_address>

### Comment 3
<location path="sensor/common/clusterentities/store_endpoints.go" line_range="30" />
<code_context>
+	// historicalEndpoints is mimicking endpointMap: endpoint hashes -> deployment id -> container port -> ticks remaining
+	historicalEndpoints map[net.BinaryHash]map[string]map[uint16]uint16
+
+	// h is the xxhash instance used for hashing endpoints
+	h hash.Hash64
+	// hashBuf is a reusable buffer for hashing (16 bytes for IPv6 addresses)
</code_context>
<issue_to_address>
**issue (complexity):** Consider simplifying the new hash-based endpoint storage by using a pure BinaryKey helper instead of a stateful hasher on endpointsStore and by replacing the generic Map[T] abstraction with a concrete doLookupEndpoint function.

You can keep the new memory layout but simplify a couple of the indirections without changing behavior.

### 1. Make `BinaryKey` pure and remove stateful hasher from `endpointsStore`

You don’t need a shared `hash.Hash64` and buffer on the store; `xxhash.Sum64` works on stack-local buffers and keeps hashing independent of the store/locks.

**Before:**

```go
type endpointsStore struct {
    // ...
    h       hash.Hash64
    hashBuf [16]byte
}

func newEndpointsStoreWithMemory(numTicks uint16) *endpointsStore {
    store := &endpointsStore{
        memorySize: numTicks,
        h:          xxhash.New(),
    }
    // ...
}

func (e *endpointsStore) applySingleNoLock(deploymentID string, data EntityData) {
    // ...
    for ep, targetInfos := range data.endpoints {
        epHash := ep.BinaryKey(e.h, &e.hashBuf)
        // ...
    }
}

func (e *endpointsStore) lookupEndpoint(endpoint net.NumericEndpoint, netLookup netAddrLookupper) {
    // ...
    epHash := endpoint.BinaryKey(e.h, &e.hashBuf)
    // ...
}
```

**After (example):**

1. Change `BinaryKey` to be a pure helper, e.g.:

```go
// in net.NumericEndpoint (or a helper in this package)
func (ep net.NumericEndpoint) BinaryKey() net.BinaryHash {
    var buf [16]byte
    // fill buf deterministically from ep.IPAndPort.Address and ep.IPAndPort.Port
    // ...
    return net.BinaryHash(xxhash.Sum64(buf[:]))
}
```

2. Drop hasher/buffer fields from the store and call the pure `BinaryKey`:

```go
type endpointsStore struct {
    mutex sync.RWMutex

    endpointMap        map[net.BinaryHash]map[string]set.Set[uint16]
    reverseEndpointMap map[string]set.Set[net.BinaryHash]

    memorySize          uint16
    historicalEndpoints map[net.BinaryHash]map[string]map[uint16]uint16
}

func newEndpointsStoreWithMemory(numTicks uint16) *endpointsStore {
    store := &endpointsStore{
        memorySize: numTicks,
    }
    concurrency.WithLock(&store.mutex, func() {
        store.initMapsNoLock()
    })
    return store
}

func (e *endpointsStore) applySingleNoLock(deploymentID string, data EntityData) {
    // ...
    for ep, targetInfos := range data.endpoints {
        epHash := ep.BinaryKey()
        // unchanged logic using epHash...
    }
}

func (e *endpointsStore) lookupEndpoint(endpoint net.NumericEndpoint, netLookup netAddrLookupper) (current, historical, ipLookup, ipLookupHistorical []LookupResult) {
    e.mutex.RLock()
    defer e.mutex.RUnlock()

    epHash := endpoint.BinaryKey()

    current = doLookupEndpoint(epHash, e.endpointMap)
    historical = doLookupEndpoint(epHash, e.historicalEndpoints)
    // rest unchanged...
}
```

This keeps memory benefits but removes shared mutable hashing state and implicit coupling to the store’s lock discipline.

---

### 2. Replace generic `Map[T]` with a concrete helper

The generic `Map[T]` abstraction adds an extra cognitive layer without real reuse. You can make `doLookupEndpoint` concrete and keep the current behavior.

**Before:**

```go
type Map[T any] interface {
    ~map[uint16]T
}

func doLookupEndpoint[M Map[T], T any](epHash net.BinaryHash, src map[net.BinaryHash]map[string]M) (results []LookupResult) {
    for deploymentID, portSet := range src[epHash] {
        result := LookupResult{
            Entity:         networkgraph.EntityForDeployment(deploymentID),
            ContainerPorts: make([]uint16, 0, len(portSet)),
        }
        for port := range portSet {
            result.ContainerPorts = append(result.ContainerPorts, port)
        }
        results = append(results, result)
    }
    return results
}
```

**After (non-generic, same logic):**

```go
func doLookupEndpoint(epHash net.BinaryHash, src map[net.BinaryHash]map[string]set.Set[uint16]) (results []LookupResult) {
    deployments := src[epHash]
    if deployments == nil {
        return nil
    }

    for deploymentID, portSet := range deployments {
        result := LookupResult{
            Entity:         networkgraph.EntityForDeployment(deploymentID),
            ContainerPorts: make([]uint16, 0, len(portSet)),
        }
        for port := range portSet {
            result.ContainerPorts = append(result.ContainerPorts, port)
        }
        results = append(results, result)
    }
    return results
}
```

And keep the caller unchanged:

```go
current = doLookupEndpoint(epHash, e.endpointMap)
historical = doLookupEndpoint(epHash, e.historicalEndpoints)
```

You still get the same behavior and shapes, but the lookup path is much easier to read.

---

These two changes alone remove the shared mutable hasher/buffer and the generic map abstraction, which addresses a significant part of the “layers of indirection” concern while preserving the new hash-based/indexed representation and per-port tracking.
</issue_to_address>

### Comment 4
<location path="pkg/net/endpoint.go" line_range="121" />
<code_context>
+
+var hashDelimiter = []byte{0}
+
+// BinaryKey produces a binary hash for this endpoint.
+// Uses xxhash for fast, non-cryptographic hashing with low collision probability.
+// The buf parameter must be at least [16]byte to avoid allocations for IPv6 addresses.
</code_context>
<issue_to_address>
**issue (complexity):** Consider simplifying `BinaryKey` by making it a pure function that builds and hashes a well-defined local buffer instead of relying on shared hash state and manual byte manipulation.

You can keep the `BinaryHash` optimization while making `BinaryKey` simpler and stateless, and avoiding shared mutable state and manual byte-twiddling.

Consider:

1. Make `BinaryKey` pure: no `hash.Hash64` or external buffer parameters.
2. Build a single local buffer with a fixed layout.
3. Use `encoding/binary` (or `xxhash` directly) instead of manual shifts.

For example, something like this keeps the same idea but is much easier to reason about and use:

```go
import (
    "encoding/binary"

    "github.com/cespare/xxhash/v2"
)

func (e NumericEndpoint) BinaryKey() BinaryHash {
    // Max: 16 bytes IP + 1 delimiter + 2 port + 8 proto = 27 bytes
    var buf [27]byte
    i := 0

    if e.IPAndPort.Address.IsValid() {
        switch data := e.IPAndPort.Address.data.(type) {
        case ipv4data:
            copy(buf[i:i+4], data[:])
            i += 4
        case ipv6data:
            copy(buf[i:i+16], data[:])
            i += 16
        }
    }

    // delimiter
    buf[i] = 0
    i++

    // port (big endian)
    binary.BigEndian.PutUint16(buf[i:i+2], uint16(e.IPAndPort.Port))
    i += 2

    // protocol (big endian, 8 bytes to preserve current layout)
    binary.BigEndian.PutUint64(buf[i:i+8], uint64(e.L4Proto))
    i += 8

    return BinaryHash(xxhash.Sum64(buf[:i]))
}
```

If changing the method signature is not acceptable, you can still reduce low-level complexity inside the current API by at least replacing the manual shifts with `binary.BigEndian` and removing the explicit 8-byte protocol write:

```go
import "encoding/binary"

func (e NumericEndpoint) BinaryKey(h hash.Hash64, buf *[16]byte) BinaryHash {
    h.Reset()

    if e.IPAndPort.Address.IsValid() {
        switch data := e.IPAndPort.Address.data.(type) {
        case ipv4data:
            copy(buf[:4], data[:])
            _, _ = h.Write(buf[:4])
        case ipv6data:
            copy(buf[:16], data[:])
            _, _ = h.Write(buf[:16])
        }
    }
    _, _ = h.Write(hashDelimiter)

    // reuse buf for port + proto
    var tmp [10]byte
    binary.BigEndian.PutUint16(tmp[0:2], uint16(e.IPAndPort.Port))
    binary.BigEndian.PutUint64(tmp[2:10], uint64(e.L4Proto))
    _, _ = h.Write(tmp[:])

    return BinaryHash(h.Sum64())
}
```

Both versions keep the memory benefits while making the data layout and encoding clearer and eliminating most of the manual offset/bit-shift logic.
</issue_to_address>