feat: add prek pre-commit hooks and dependabot (#1720)

* feat: add prek pre-commit hooks and dependabot

Pre-commit hooks (via prek):
- Basic hygiene: trailing-whitespace, end-of-file-fixer, check-yaml, check-added-large-files, check-merge-conflict
- Security: detect-secrets, zizmor (GitHub Actions audit)
- Linting: shellcheck, actionlint, oxlint, swiftlint
- Formatting: oxfmt, swiftformat

Dependabot:
- npm and GitHub Actions ecosystems
- Grouped updates (production/development/actions)
- 7-day cooldown for supply chain protection

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* docs: add prek install instruction to AGENTS.md

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

extensions/voice-call/src/manager/context.ts

@@ -19,4 +19,3 @@ export type CallManagerContext = {
   transcriptWaiters: Map<CallId, TranscriptWaiter>;
   maxDurationTimers: Map<CallId, NodeJS.Timeout>;
 };
-

extensions/voice-call/src/manager/events.ts

@@ -175,4 +175,3 @@ export function processEvent(ctx: CallManagerContext, event: NormalizedEvent): v
 
   persistCallRecord(ctx.storePath, call);
 }
-

extensions/voice-call/src/manager/lookup.ts

@@ -31,4 +31,3 @@ export function findCall(params: {
     providerCallId: params.callIdOrProviderCallId,
   });
 }
-

extensions/voice-call/src/manager/state.ts

@@ -48,4 +48,3 @@ export function addTranscriptEntry(
   };
   call.transcript.push(entry);
 }
-

extensions/voice-call/src/manager/store.ts

@@ -86,4 +86,3 @@ export async function getCallHistoryFromStore(
 
   return calls;
 }
-

extensions/voice-call/src/manager/timers.ts

@@ -84,4 +84,3 @@ export function waitForFinalTranscript(
     ctx.transcriptWaiters.set(callId, { resolve, reject, timeout });
   });
 }
-

extensions/voice-call/src/manager/twiml.ts

@@ -7,4 +7,3 @@ export function generateNotifyTwiml(message: string, voice: string): string {
   <Hangup/>
 </Response>`;
 }
-