M4 Meta adapters + OAuth + 24h window + M2 hardening

Shipped: July 3, 2026 at 3:22 AM UTC
Author: Kamo
Commit: b618a2e

- Meta adapters (Messenger/Instagram): fix invalid _caption send (caption now a follow-up message), bytes-upload via Graph Attachment Upload API, URI encode fix in MetaGraphClient - Telegram adapter: multipart bytes upload for outbound images (providers cannot fetch the auth-gated /imaging/proxy URL) - SocialCredsResolver: populate creds.extra appSecret/verifyToken for Meta from social.meta.* - MetaOAuthController: Facebook/Instagram OAuth connect (start+callback), encrypts page token - MediaController outbound: image bytes-upload (M2b) + 24h messaging-window gating (M4c) - SocialReconciliationSweep: re-publish social.lead.new for orphaned conversations (M2a durability) - config: social.meta.* + social.reconcile.* + optional social-meta secret

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