fix(lint): delete dead ws broadcast cluster; demote phase-header comments

golangci-lint had been failing invisibly behind the earlier CI gate
failures. Default-build lint is now clean:

- Delete the unused pre-topic-limiter rate-limit constants, the unused
  bluemonday sanitizer, and the dead broadcast variants superseded by
  their Low/High counterparts (broadcastExclude,
  broadcastToDMParticipants(+Exclude), sendSequencedToUsers,
  PubSub.debugDump). Test references were comments only; updated to
  name the live variants.
- Separate 'Phase X Step Y' file headers from the package clause with a
  blank line so staticcheck ST1000 no longer reads them as malformed
  package comments (proper package docs exist in hub.go/manifest.go).
- Add .gitattributes normalizing line endings to LF on checkout —
  the Windows CI runner materialized CRLF, which made every
  prettier-formatted file fail the format gate.

Known remainder (pre-existing, out of P0 scope): golangci-lint with
-tags wazero reports 3 gosec + 2 staticcheck and -tags otel 1+1; CI
lints the default build. Tracked for the P1 plugin pass.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Server/plugin/host_storage.go

@@ -3,6 +3,7 @@
 // Plugins get a per-plugin namespaced KV store backed by the PluginStore
 // rows in the events/plugin schema. Capacity caps and value-size caps are
 // enforced here so a misbehaving plugin can't fill the database.
+
 package plugin
 
 import (

Server/plugin/host_ui.go

@@ -3,6 +3,7 @@
 // A plugin that declares the `ui` capability ships HTML/CSS/JS assets and a
 // list of tabs. The host serves those assets at /api/v1/plugins/<name>/ui/...
 // and the Solid.js client bridge renders each tab inside a sandboxed iframe.
+
 package plugin
 
 import (

Server/plugin/loader.go

@@ -13,6 +13,7 @@
 //
 // Loader walks the directory, parses every plugin.json, and returns a slice
 // of foundPlugin records. The Registry then persists each into the store.
+
 package plugin
 
 import (

Server/plugin/manifest_nottoml.go

@@ -1,6 +1,7 @@
 //go:build !wazero
 
 // Default build stub — TOML manifest parsing is not compiled in without -tags wazero.
+
 package plugin
 
 // tryLoadPluginTOML always reports "not present" in the default build so the

Server/plugin/registry.go

@@ -9,6 +9,7 @@
 // directory and persists each manifest into the PluginStore so admins can see
 // what is "installed", but the .wasm files are NOT executed. Calling
 // Dispatch() in the default build returns ErrRuntimeUnavailable.
+
 package plugin
 
 import (

Server/plugin/sandbox_default.go

@@ -3,6 +3,7 @@
 // Default plugin runtime: no Wazero. Plugin manifests are still discovered,
 // persisted, and surfaced through the admin API, but `.wasm` modules are not
 // executed. To enable real WASM execution build with `-tags wazero`.
+
 package plugin
 
 import (

Server/ws/dm_handlers_test.go

@@ -294,7 +294,7 @@ func TestDM_ChatEdit_ParticipantCanEdit(t *testing.T) {
 	hub.HandleMessageForTest(cAlice, dmChatEditMsg(msgID, "edited"))
 	time.Sleep(100 * time.Millisecond)
 
-	// Alice should receive the chat_edited broadcast (via broadcastToDMParticipants).
+	// Alice should receive the chat_edited broadcast (via the sequenced DM event path).
 	msgs := dmDrainAll(sendAlice)
 	edited := dmFindMsgType(msgs, "chat_edited")
 	if edited == nil {

Server/ws/emit_test.go

@@ -186,7 +186,7 @@ func TestEmitEvents_ExcludeSenderEvent(t *testing.T) {
 
 	h.EmitEvents(events)
 
-	// broadcastExclude is synchronous — check immediately.
+	// broadcastExcludeLow is synchronous — check immediately.
 	senderMsgs := drainChan(sendSender, 50*time.Millisecond)
 	otherMsgs := drainChan(sendOther, 50*time.Millisecond)
 

Server/ws/event_pruner.go

@@ -3,6 +3,7 @@
 // StartEventPruner runs a background goroutine that deletes events older than
 // the configured retention window. It is the bounded-storage half of the
 // event persistence design: the persister appends, the pruner trims.
+
 package ws
 
 import (

Server/ws/handlers.go

@@ -5,30 +5,11 @@ import (
 	"encoding/json"
 	"fmt"
 	"log/slog"
-	"time"
 
-	"github.com/microcosm-cc/bluemonday"
 	"github.com/owncord/server/auth"
 	"github.com/owncord/server/db"
 )
 
-// Rate limit windows.
-const (
-	chatRateLimit     = 10
-	chatWindow        = time.Second
-	typingRateLimit   = 1
-	typingWindow      = 3 * time.Second
-	presenceRateLimit = 1
-	presenceWindow    = 10 * time.Second
-	reactionRateLimit = 5
-	reactionWindow    = time.Second
-)
-
-// maxMessageLen is the maximum allowed message length in runes (Unicode code points).
-const maxMessageLen = 4000
-
-var sanitizer = bluemonday.StrictPolicy()
-
 // HandleMessageForTest dispatches a raw WebSocket message from client c.
 // Exported so ws_test package can invoke it directly without a real connection.
 func (h *Hub) HandleMessageForTest(c *Client, raw []byte) {
@@ -226,21 +207,11 @@ func (h *Hub) requireChannelPerm(c *Client, channelID int64, perm int64, permLab
 	return false
 }
 
-// broadcastExclude sends a message to all clients in the sender's channel
-// EXCEPT the sender. Unlike hub.BroadcastToChannel, messages sent via this
-// function are NOT stored in the replay ring buffer — they are ephemeral.
-// This is correct for typing indicators but would be incorrect for messages
-// that should survive reconnection replay.
-func (h *Hub) broadcastExclude(channelID, excludeUserID int64, msg []byte) {
-	if channelID == 0 {
-		h.pubsub.Publish(TopicGlobal, msg, excludeUserID)
-		return
-	}
-	h.pubsub.Publish(ChannelTopic(channelID), msg, excludeUserID)
-}
-
-// broadcastExcludeLow is like broadcastExclude but at low priority.
-// Used for typing indicators — dropped on overflow instead of disconnecting.
+// broadcastExcludeLow sends a message at low priority to all clients in the
+// sender's channel EXCEPT the sender. Messages sent via this function are NOT
+// stored in the replay ring buffer — they are ephemeral. This is correct for
+// typing indicators (dropped on overflow instead of disconnecting) but would
+// be incorrect for messages that should survive reconnection replay.
 func (h *Hub) broadcastExcludeLow(channelID, excludeUserID int64, msg []byte) {
 	if channelID == 0 {
 		h.pubsub.PublishLow(TopicGlobal, msg, excludeUserID)
@@ -249,31 +220,3 @@ func (h *Hub) broadcastExcludeLow(channelID, excludeUserID int64, msg []byte) {
 	h.pubsub.PublishLow(ChannelTopic(channelID), msg, excludeUserID)
 }
 
-// broadcastToDMParticipants sends a message to all participants of a DM channel
-// while preserving DM semantics (delivery is by participant, not channel focus).
-// Unlike broadcastToDMParticipantsExclude, this path is sequenced and replayable.
-func (h *Hub) broadcastToDMParticipants(channelID int64, msg []byte) {
-	participantIDs, err := h.db.GetDMParticipantIDs(channelID)
-	if err != nil {
-		slog.Error("broadcastToDMParticipants GetDMParticipantIDs", "err", err, "channel_id", channelID)
-		return
-	}
-	h.sendSequencedToUsers(channelID, participantIDs, msg)
-}
-
-// broadcastToDMParticipantsExclude sends a message to all participants of a DM
-// channel EXCEPT the specified user. Used for ephemeral events like typing
-// indicators where echoing back to the sender is undesirable.
-func (h *Hub) broadcastToDMParticipantsExclude(channelID, excludeUserID int64, msg []byte) {
-	participantIDs, err := h.db.GetDMParticipantIDs(channelID)
-	if err != nil {
-		slog.Error("broadcastToDMParticipantsExclude GetDMParticipantIDs", "err", err, "channel_id", channelID)
-		return
-	}
-	for _, pid := range participantIDs {
-		if pid == excludeUserID {
-			continue
-		}
-		h.SendToUser(pid, msg)
-	}
-}

Server/ws/handlers_command.go

@@ -5,6 +5,7 @@
 // plugin returns a Reply, it is sent only to the invoking client (ephemeral).
 // If the plugin returns a Broadcast string, it is broadcast to the channel
 // only after verifying the invoking client holds SEND_MESSAGES permission.
+
 package ws
 
 import (

Server/ws/handlers_test.go

@@ -1695,7 +1695,7 @@ func TestTyping_RateLimited_SilentlyDropped(t *testing.T) {
 
 // TestBroadcastExclude_SendsToOthersNotSelf verifies that broadcastExclude
 // delivers to all channel members except the excluded user.
-// This is exercised indirectly via typing_start (which calls broadcastExclude).
+// This is exercised indirectly via typing_start (which calls broadcastExcludeLow).
 func TestBroadcastExclude_SendsToOthersNotSelf(t *testing.T) {
 	hub, database := newHandlerHub(t)
 	chID := seedTestChannel(t, database, "excl-chan1")

Server/ws/hub.go

@@ -555,26 +555,9 @@ func (h *Hub) BroadcastToAllLow(msg []byte) {
 	h.pubsub.PublishGlobalLow(msg)
 }
 
-// sendSequencedToUsers stamps msg with a monotonic seq, stores it in the replay
-// buffer under channelID, and fanouts the wrapped payload to the provided users.
-func (h *Hub) sendSequencedToUsers(channelID int64, userIDs []int64, msg []byte) {
-	h.seqMu.Lock()
-	defer h.seqMu.Unlock()
-
-	seq := h.nextSeq()
-	wrapped := wrapWithSeq(msg, seq)
-
-	// Store DM event for reconnect replay; filtering is channel-based and uses
-	// allowed channel IDs computed at auth time (including open DMs).
-	h.replayBuf.Push(seq, channelID, wrapped)
-	h.persistEvent(seq, channelID, wrapped)
-
-	for _, userID := range userIDs {
-		h.SendToUser(userID, wrapped)
-	}
-}
-
-// sendSequencedToUsersHigh is like sendSequencedToUsers but uses high-priority delivery.
+// sendSequencedToUsersHigh stamps msg with a monotonic seq, stores it in the
+// replay buffer under channelID, and fans the wrapped payload out to the
+// provided users with high-priority delivery.
 func (h *Hub) sendSequencedToUsersHigh(channelID int64, userIDs []int64, msg []byte) {
 	h.seqMu.Lock()
 	defer h.seqMu.Unlock()

Server/ws/pubsub.go

@@ -2,7 +2,6 @@ package ws
 
 import (
 	"fmt"
-	"log/slog"
 	"sync"
 )
 
@@ -217,16 +216,3 @@ func (ps *PubSub) TopicsForClient(userID int64) []Topic {
 	}
 	return result
 }
-
-// debugDump logs the current subscription state. For development use only.
-func (ps *PubSub) debugDump() {
-	ps.mu.RLock()
-	defer ps.mu.RUnlock()
-	for topic, subs := range ps.topics {
-		ids := make([]int64, 0, len(subs))
-		for uid := range subs {
-			ids = append(ids, uid)
-		}
-		slog.Debug("pubsub: topic", "topic", string(topic), "subscribers", ids)
-	}
-}