Announce retirement of public API client libraries

[andypettey]

Summary

• Adds a prominent retirement notice to the README announcing that no new versions of the client libraries will be published after November 1, 2026 (6 months from May 1, 2026).
• Explains the rationale: given the changing AI landscape, organizations are better served by generating/implementing their own clients.
• Notes that the OpenAPI specification will continue to be maintained and updated.
• Removes the contribution invitation line, as new contributions to the clients are no longer expected.

Test plan

• Review the README renders correctly on GitHub
• Confirm retirement date (November 1, 2026) is accurate
• Confirm messaging/tone is appropriate for public announcement

🤖 Generated with Claude Code

[github-actions]

Coverage report for commit: 7441eed
File: packages/miro-api/coverage/clover.xml

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      └─────────────────────────┘
 *Legend:* █ = Current Distribution 

Summary - Lines: 72.32% | Methods: 73.66% | Branches: 48.66%

Files	Lines	Methods	Branches
packages/miro-api
api.ts	100.00%	100.00%	84.62%
index.ts	71.93%	40.91%	82.67%
storage.ts	100.00%	100.00%	66.67%
packages/miro-api/api
apis.ts	1.53%	4.41%	0.69%
packages/miro-api/highlevel
Api.ts	75.00%	85.71%	47.62%
AppCardItem.ts	100.00%	100.00%	73.33%
Board.ts	56.52%	53.33%	25.40%
CardItem.ts	100.00%	100.00%	73.33%
DocumentItem.ts	79.41%	88.89%	64.71%
EmbedItem.ts	100.00%	100.00%	73.33%
FrameItem.ts	83.33%	100.00%	36.00%
ImageItem.ts	79.41%	88.89%	64.71%
Item.ts	100.00%	100.00%	83.33%
Organization.ts	66.67%	71.43%	42.11%
ShapeItem.ts	100.00%	100.00%	73.33%
StickyNoteItem.ts	100.00%	100.00%	73.33%
Tag.ts	100.00%	100.00%	63.16%
Team.ts	60.00%	71.43%	34.78%
TextItem.ts	100.00%	100.00%	73.33%
helpers.ts	91.67%	75.00%	66.67%
index.ts	47.90%	25.35%	52.38%
packages/miro-api/model
actor.ts	85.71%	77.78%	66.67%
addProjectMemberRequest.ts	88.89%	77.78%	66.67%
adminRole.ts	89.66%	80.00%	64.71%
appCardCreateRequest.ts	80.00%	77.78%	66.67%
appCardData.ts	81.25%	80.00%	64.71%
appCardDataChanges.ts	83.87%	80.00%	64.71%
appCardDataResponse.ts	81.25%	80.00%	64.71%
appCardItem.ts	97.30%	88.89%	66.67%
appCardStyle.ts	92.31%	77.78%	66.67%
appCardStylePlatformbulkcreateoperation.ts	92.31%	77.78%	66.67%
appCardUpdateRequest.ts	80.00%	77.78%	66.67%
auditContext.ts	85.71%	77.78%	66.67%
auditCreatedBy.ts	83.87%	80.00%	64.71%
auditEvent.ts	72.73%	77.78%	66.67%
auditObject.ts	88.89%	77.78%	66.67%
auditOrganization.ts	88.89%	77.78%	66.67%
auditPage.ts	80.00%	77.78%	66.67%
auditTeam.ts	88.89%	77.78%	66.67%
basicEntityInfo.ts	88.89%	77.78%	66.67%
basicError.ts	82.76%	77.78%	66.67%
basicErrorEnterpriseUserSessionResetEnterprisePlan.ts	82.76%	77.78%	66.67%
basicErrorOrganizationsEnterprisePlan.ts	82.76%	77.78%	66.67%
board.ts	97.62%	88.89%	66.67%
boardChanges.ts	80.00%	77.78%	66.67%
boardDataClassificationLabel.ts	75.00%	77.78%	66.67%
boardExportJob.ts	72.73%	77.78%	66.67%
boardExportJobCreator.ts	92.31%	77.78%	66.67%
boardExportJobId.ts	92.31%	77.78%	66.67%
boardExportJobStatus.ts	92.31%	77.78%	66.67%
boardExportJobTasksCount.ts	85.71%	77.78%	66.67%
boardExportJobTasksList.ts	85.71%	77.78%	66.67%
boardExportJobsList.ts	85.71%	77.78%	66.67%
boardExportResult.ts	88.89%	77.78%	66.67%
boardExportTask.ts	75.00%	77.78%	66.67%
boardExportTaskBoard.ts	92.31%	77.78%	66.67%
boardExportTaskExportLink.ts	77.42%	77.78%	66.67%
boardExportTaskResult.ts	80.00%	77.78%	66.67%
boardFormat.ts	100.00%	100.00%	76.92%
boardItemContentLog.ts	72.97%	80.00%	64.71%
boardLinks.ts	88.89%	77.78%	66.67%
boardMember.ts	96.77%	90.00%	64.71%
boardMemberChanges.ts	92.86%	80.00%	64.71%
boardMemberWithLinks.ts	81.25%	80.00%	64.71%
boardMembersInvite.ts	86.67%	80.00%	64.71%
boardMembersPagedResponse.ts	75.00%	77.78%	66.67%
boardPermissionsPolicy.ts	87.50%	80.00%	64.71%
boardPolicy.ts	88.89%	77.78%	66.67%
boardPolicyChange.ts	88.89%	77.78%	66.67%
boardProject.ts	92.31%	77.78%	66.67%
boardSharingPolicy.ts	82.86%	80.00%	64.71%
boardSharingPolicyChange.ts	85.29%	80.00%	64.71%
boardSubscription.ts	76.47%	80.00%	64.71%
boardSubscriptionData.ts	92.31%	77.78%	66.67%
boardUserGroup.ts	86.67%	80.00%	64.71%
boardUserGroupsPage.ts	80.00%	77.78%	66.67%
boardWithLinks.ts	58.54%	77.78%	66.67%
boardWithLinksAndLastOpened.ts	55.81%	77.78%	66.67%
boardWithLinksAndWithoutProject.ts	60.00%	77.78%	66.67%
boardsPagedResponse.ts	75.00%	77.78%	66.67%
bulkOperationError.ts	80.00%	77.78%	66.67%
bulkOperationErrorContext.ts	92.31%	77.78%	66.67%
bulkSubOperationError.ts	85.71%	77.78%	66.67%
caption.ts	86.67%	80.00%	64.71%
cardCreateRequest.ts	80.00%	77.78%	66.67%
cardData.ts	82.76%	77.78%	66.67%
cardDataPlatformbulkcreateoperation.ts	82.76%	77.78%	66.67%
cardItem.ts	97.30%	88.89%	66.67%
cardStyle.ts	92.31%	77.78%	66.67%
cardStylePlatformbulkcreateoperation.ts	92.31%	77.78%	66.67%
cardUpdateRequest.ts	80.00%	77.78%	66.67%
caseRequest.ts	88.89%	77.78%	66.67%
caseResponse.ts	72.73%	77.78%	66.67%
connectorChangesData.ts	81.25%	80.00%	64.71%
connectorCreationData.ts	81.25%	80.00%	64.71%
connectorStyle.ts	76.32%	80.00%	64.71%
connectorWithLinks.ts	97.50%	90.00%	64.71%
connectorsCursorPaged.ts	77.42%	77.78%	66.67%
copyBoardChanges.ts	82.76%	77.78%	66.67%
createBoardExportRequest.ts	88.89%	77.78%	66.67%
createBoardSubscriptionRequest.ts	86.67%	80.00%	64.71%
createBoardUserGroupsRequest.ts	89.66%	80.00%	64.71%
createDocumentItemUsingFileFromDeviceRequestData.ts	82.76%	77.78%	66.67%
createFrameItem400Response.ts	82.76%	77.78%	66.67%
createGroupMemberRequest.ts	92.31%	77.78%	66.67%
createGroupRequest.ts	88.89%	77.78%	66.67%
createProjectRequest.ts	92.31%	77.78%	66.67%
createProjectUserGroupsRequest.ts	89.66%	80.00%	64.71%
createTeamGroupRequest.ts	89.66%	80.00%	64.71%
createTeamRequest.ts	92.31%	77.78%	66.67%
createUserResource.ts	70.27%	80.00%	64.71%
createUserResourceName.ts	85.71%	77.78%	66.67%
createUserResourcePhotosInner.ts	88.89%	77.78%	66.67%
createUserResourceRolesInner.ts	82.76%	77.78%	66.67%
createUserResourceUrnIetfParamsScimSchemasExtensionEnterprise20User.ts	77.42%	77.78%	66.67%
createUserResourceUrnIetfParamsScimSchemasExtensionEnterprise20UserManager.ts	88.89%	77.78%	66.67%
createdBy.ts	88.89%	77.78%	66.67%
createdByPlatformContainers.ts	88.89%	77.78%	66.67%
createdByPlatformExperimentalFeatures.ts	88.89%	77.78%	66.67%
createdByPlatformFileUpload.ts	88.89%	77.78%	66.67%
createdByPlatformTags.ts	88.89%	77.78%	66.67%
createdByPlatformcreateitemsinbulkusingfilefromdevice.ts	88.89%	77.78%	66.67%
createdByPlatformgroups.ts	88.89%	77.78%	66.67%
customField.ts	78.79%	80.00%	64.71%
customFieldPlatformTags.ts	78.79%	80.00%	64.71%
customFieldPlatformbulkcreateoperation.ts	78.79%	80.00%	64.71%
dataClassificationLabel.ts	70.59%	77.78%	66.67%
dataClassificationLabelId.ts	92.31%	77.78%	66.67%
dataClassificationOrganizationSettings.ts	85.71%	77.78%	66.67%
dataClassificationTeamSettings.ts	85.71%	77.78%	66.67%
docFormatCreateRequest.ts	85.71%	77.78%	66.67%
docFormatData.ts	86.67%	80.00%	64.71%
docFormatDataPlatform.ts	86.67%	80.00%	64.71%
docFormatHtmlData.ts	86.67%	80.00%	64.71%
docFormatItem.ts	68.57%	77.78%	66.67%
docFormatMarkdownData.ts	86.67%	80.00%	64.71%
documentCreateRequest.ts	85.71%	77.78%	66.67%
documentData.ts	88.89%	77.78%	66.67%
documentDataResponse.ts	88.89%	77.78%	66.67%
documentDataResponsePlatformcreateitemsinbulkusingfilefromdevice.ts	88.89%	77.78%	66.67%
documentItem.ts	97.22%	88.89%	66.67%
documentItemPlatformFileUpload.ts	66.67%	77.78%	66.67%
documentUpdateRequest.ts	82.76%	77.78%	66.67%
documentUrlData.ts	88.89%	77.78%	66.67%
documentUrlDataChanges.ts	88.89%	77.78%	66.67%
documentUrlDataPlatformbulkcreateoperation.ts	88.89%	77.78%	66.67%
embedCreateRequest.ts	82.76%	77.78%	66.67%
embedData.ts	72.22%	80.00%	64.71%
embedDataResponse.ts	72.22%	80.00%	64.71%
embedItem.ts	97.22%	88.89%	66.67%
embedUpdateRequest.ts	82.76%	77.78%	66.67%
embedUrlData.ts	86.67%	80.00%	64.71%
embedUrlDataChanges.ts	86.67%	80.00%	64.71%
embedUrlDataPlatformbulkcreateoperation.ts	86.67%	80.00%	64.71%
enterpriseGetOrganizationMembers200Response.ts	80.00%	77.78%	66.67%
enterpriseUpdateBoardExportJob200Response.ts	92.31%	77.78%	66.67%
enterpriseUpdateBoardExportJob200ResponseStatus.ts	92.31%	77.78%	66.67%
Table truncated to fit comment

_{🤖 comment via lucassabreu/comment-coverage-clover}

[andypettey]

Closing in favour of #492 — README changes moved to a dedicated deprecation_notice branch.