fix: comprehensive BlueBubbles and channel cleanup (#11093)

* feat(bluebubbles): auto-strip markdown from outbound messages (#7402)

* fix(security): add timeout to webhook body reading (#6762)

Adds 30-second timeout to readBody() in voice-call, bluebubbles, and nostr
webhook handlers. Prevents Slow-Loris DoS (CWE-400, CVSS 7.5).
Merged with existing maxBytes protection in voice-call.

* fix(security): unify Error objects and lint fixes in webhook timeouts (#6762)

* fix: prevent plugins from auto-enabling without user consent (#3961)

Changes default plugin enabled state from true to false in enablePluginEntry().
Preserves existing enabled:true values. Fixes #3932.

* fix: apply hierarchical mediaMaxMb config to all channels (#8749)

Generalizes resolveAttachmentMaxBytes() to use account → channel → global
config resolution for all channels, not just BlueBubbles. Fixes #7847.

* fix(bluebubbles): sanitize attachment filenames against header injection (#10333)

Strip ", \r, \n, and \\ from filenames after path.basename() to prevent
multipart Content-Disposition header injection (CWE-93, CVSS 5.4).
Also adds sanitization to setGroupIconBlueBubbles which had zero filename
sanitization.

* fix(lint): exclude extensions/ from Oxlint preflight check (#9313)

Extensions use PluginRuntime|null patterns that trigger
no-redundant-type-constituents because PluginRuntime resolves to any.
Excluding extensions/ from Oxlint unblocks user upgrades.
Re-applies the approach from closed PR #10087.

* fix(bluebubbles): add tempGuid to createNewChatWithMessage payload (#7745)

Non-Private-API mode (AppleScript) requires tempGuid in send payloads.
The main sendMessageBlueBubbles already had it, but createNewChatWithMessage
was missing it, causing 400 errors for new chat creation without Private API.

* fix: send stop-typing signal when run ends with NO_REPLY (#8785)

Adds onCleanup callback to the typing controller that fires when the
controller is cleaned up while typing was active (e.g., after NO_REPLY).
Channels using createTypingCallbacks automatically get stop-typing on
cleanup. This prevents the typing indicator from lingering in group chats
when the agent decides not to reply.

* fix(telegram): deduplicate skill commands in multi-agent setup (#5717)

Two fixes:
1. Skip duplicate workspace dirs when listing skill commands across agents.
   Multiple agents sharing the same workspace would produce duplicate commands
   with _2, _3 suffixes.
2. Clear stale commands via deleteMyCommands before registering new ones.
   Commands from deleted skills now get cleaned up on restart.

* fix: add size limits to unbounded in-memory caches (#4948)

Adds max-size caps with oldest-entry eviction to prevent OOM in
long-running deployments:
- BlueBubbles serverInfoCache: 64 entries (already has TTL)
- Google Chat authCache: 32 entries
- Matrix directRoomCache: 1024 entries
- Discord presenceCache: 5000 entries per account

* fix: address review concerns (#11093)

- Chain deleteMyCommands → setMyCommands to prevent race condition (#5717)
- Rename enablePluginEntry to registerPluginEntry (now sets enabled: false)
- Add Slow-Loris timeout test for readJsonBody (#6023)

src/infra/outbound/message-action-runner.ts

@@ -279,12 +279,8 @@ function resolveAttachmentMaxBytes(params: {
   channel: ChannelId;
   accountId?: string | null;
 }): number | undefined {
-  const fallback = params.cfg.agents?.defaults?.mediaMaxMb;
-  if (params.channel !== "bluebubbles") {
-    return typeof fallback === "number" ? fallback * 1024 * 1024 : undefined;
-  }
   const accountId = typeof params.accountId === "string" ? params.accountId.trim() : "";
-  const channelCfg = params.cfg.channels?.bluebubbles;
+  const channelCfg = params.cfg.channels?.[params.channel];
   const channelObj =
     channelCfg && typeof channelCfg === "object"
       ? (channelCfg as Record<string, unknown>)
@@ -300,6 +296,7 @@ function resolveAttachmentMaxBytes(params: {
     accountCfg && typeof accountCfg === "object"
       ? (accountCfg as Record<string, unknown>).mediaMaxMb
       : undefined;
+  // Priority: account-specific > channel-level > global default
   const limitMb =
     (typeof accountMediaMax === "number" ? accountMediaMax : undefined) ??
     channelMediaMax ??