feat(publish): real AdaptlyPost MCP wiring (9 platforms, DRY_RUN-aware)

[wesleysimplicio]

Context

lib/publish/adaptlypost.ts:19-41 is a mock that returns https://adaptlypost.test/drafts/<id> regardless of DRY_RUN. SETUP.md § 5 documents the MCP setup (@adaptlypost/mcp-server).

Goal

Real adapter that schedules pieces through the AdaptlyPost MCP across the 9 supported platforms.

Acceptance criteria

• Reads ADAPTLYPOST_API_KEY; throws clearly if missing and DRY_RUN=false
• Maps platforms array to the AdaptlyPost MCP tool params (IG, TikTok, Facebook, LinkedIn, X, Threads, Pinterest, YouTube Shorts, FB Reels)
• Validates each platform's media_paths against qa-tech-specs before scheduling (refuse to schedule if any platform fails its hard specs)
• Honors DRY_RUN=true → write draft payload to outputs/<piece>/adaptlypost-draft.json and return synthetic URL
• Real path returns actual draft URL from the MCP
• Retries on transient MCP errors (3 attempts, exponential backoff; AGENTS-style)
• After 3 failures, the piece status flips to review with error transcript (per DESIGN.md § Failure Modes)
• E2E spec with mocked MCP transport

Files

• lib/publish/adaptlypost.ts:19-41
• e2e/adaptlypost-publish.spec.ts (extend, do not replace existing test)

Depends on

• #qa-tech-specs (validation step)

[wesleysimplicio]

Closed after PR #40 follow-up stabilization in commit f40b58d. Current main passes npm run typecheck and npm run test:e2e (119 Playwright specs green), and this tracker item is being retired per repository cleanup.