Cal.com v6.1.15 — Release Notes & Engineering Impact

## What's Changed * chore: resolve @modelcontextprotocol/sdk to 1.26.0 by @pedroccastro in https://github.com/calcom/cal.com/pull/27640 * fix: update booking page terms text to use APP_NAME instead of "our" by @CarinaWolli in https://github.com/calcom/cal.com/pull/27834 * fix: add i18n + migration for booking history pbac by @sean-brydon in https://github.com/calcom/cal.com/pull/27836 * fix: API v2 `@GetWebhook()` decorator doesn't generate OpenAPI path by @Ryukemeister in https://github.com/calcom/cal.com/pull/27612 * perf: optimize getBusyTimesForLimitChecks with batched parallel queries by @Udit-takkar in https://github.com/calcom/cal.com/pull/27399 * feat: refactor billing to strategy implemention by @sean-brydon in https://github.com/calcom/cal.com/pull/27828 * refactor: apply biome formatting to apps/web by @eunjae-lee in https://github.com/calcom/cal.com/pull/27692 * feat: add claude specs by @Udit-takkar in https://github.com/calcom/cal.com/pull/26852 * fix: renamed `rediss://` to `redis://` in .env.example by @romitg2 in https://github.com/calcom/cal.com/pull/27478 * fix: hide cancel/reschedule links in emails when disabled by @evertonresende in https://github.com/calcom/cal.com/pull/27637 * Populated Contributing Section with a welcoming summary by @Kmadhav824 in https://github.com/calcom/cal.com/pull/27830 * fix: use randomString() for booking UIDs in slots E2E tests by @anikdhabal in https://github.com/calcom/cal.com/pull/27847 * fix: ensure metadata key is always present in BOOKING_CREATED webhook payload by @devin-ai-integration[bot] in https://github.com/calcom/cal.com/pull/27300 * feat: caretta.so app by @PeerRich in https://github.com/calcom/cal.com/pull/27840 * fix: unable to add and remove org banner by @anikdhabal in https://github.com/calcom/cal.com/pull/27848 * feat: add UTM parameter data to insights bookings CSV download by @CarinaWolli in https://github.com/calcom/cal.com/pull/27854 * chore: add agent rules to prevent circular dependencies between packages by @hbjORbj in https://github.com/calcom/cal.com/pull/27860 * feat(form-builder): format field labels to display human-readable names by @Shrey-Sutariya in https://github.com/calcom/cal.com/pull/27858 * fix: adjusted zoho Token expiry time to miliseconds. by @saptarshi-bose in https://github.com/calcom/cal.com/pull/27855 * feat: add fallback action options to routing form fallback section by @joeauyeung in https://github.com/calcom/cal.com/pull/27449 * perf: use UNION ALL with DISTINCT for bookings query optimization by @keithwillcode in https://github.com/calcom/cal.com/pull/27841 * refactor: apply biome formatting to packages/features by @eunjae-lee in https://github.com/calcom/cal.com/pull/27844 * fix: few flaky api v2 e2e tests by @anikdhabal in https://github.com/calcom/cal.com/pull/27849 * feat: login overlay re design by @Udit-takkar in https://github.com/calcom/cal.com/pull/27800 * fix: Improve wrong assignment report by @joeauyeung in https://github.com/calcom/cal.com/pull/27162 * chore(deps): resolve fast-xml-parser to 5.3.4 by @pedroccastro in https://github.com/calcom/cal.com/pull/27887 * fix: maintain uid parameter in BookingDetailsSheet URL by @eunjae-lee in https://github.com/calcom/cal.com/pull/27872 * feat: re-render bookings page after feature opt-in without full refresh by @eunjae-lee in https://github.com/calcom/cal.com/pull/27873 * fix(form-builder): correct value of selection box behavior in Edit of new Added Question dialog by @Shrey-Sutariya in https://github.com/calcom/cal.com/pull/27890 * fix: feedback dialog overlay on intercom by @dhairyashiil in https://github.com/calcom/cal.com/pull/27892 * chore: Remove /api/ routes from proxy by @keithwillcode in https://github.com/calcom/cal.com/pull/27883 * feat: add list formatting options to profile and event description editor by @SinghaAnirban005 in https://github.com/calcom/cal.com/pull/27838 * fix: support underscores in workflow template variables with backward compatibility by @hariombalhara in https://github.com/calcom/cal.com/pull/27571 * feat: add wrong routing tab under Insights for reviewing assignment reports by @joeauyeung in https://github.com/calcom/cal.com/pull/27423 ## New Contributors * @Kmadhav824 made their first contribution in https://github.com/calcom/cal.com/pull/27830 * @saptarshi-bose made their first contribution in https://github.com/calcom/cal.com/pull/27855 **Full Changelog**: https://github.com/calcom/cal.com/compare/v6.1.14...v6.1.15