Release v6.0.0: regen from current spec

[winrid]

Regenerates fastcomments-sdk from the current FastComments spec and bumps to 6.0.0. Supersedes #14 (the unpublished 5.0.3 regen), which is included here.

New

• sso query param on every page react method in PublicApi (getV1PageLikes, createV1PageReact, deleteV1PageReact, getV2PageReacts, getV2PageReactUsers, createV2PageReact, deleteV2PageReact), so SSO users can like and react to pages.
• Webhooks API: getWebhooks, createWebhook, deleteWebhook, getWebhookSamplePayloads.
• Polls API: getPoll, putPoll, patchPoll, deletePoll, and poll votes getPollVotes, getPollVote, createPollVote, deletePollVote.
• getMe and createAgentTenant.
• deleteV1PageReact now returns code: 'not-liked' when there is no like to remove (server change, was 'already-liked').

Breaking (why this is 6.0.0)

• Built from the tsoa 6.6.8 spec, which splits T | APIError returns. Methods now return their real success types, and the per-operation wrapper models are removed (about 170 exports, for example GetCommentsResponse, SaveCommentResponse, GetFeedPostsPublicResponse, GetV1PageLikesResponse, and all *Response1 collision models). No methods were removed or renamed.
• Moderation methods call the server's current /auth/my-account/moderate-comments/mod_api/... paths.

Checks

• npm run build compiles clean.
• test:unit 22/22 and test:browser 7/7 pass locally. Integration tests run in CI.

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