Mark posts that disappear from X instead of erasing them; pin mcp below 2

social.x_deletions checks stored posts through the official API. A post X
reports as not found keeps a marked record (author, link, dates, Internet
Archive link if a copy exists) while every copy of its text is removed, as
the Developer Agreement requires. A post that shows up in the timeline again
is restored by the normal upsert.

mcp 2.x removed FastMCP, which crash-looped the MCP server on first deploy.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/roadmap.md

@@ -31,6 +31,7 @@ Next.js frontend (de/en), Docker Compose for Unraid.
 - [x] Political ads: Google (bundle), Meta Ad Library (opt-in token)
 - [x] Social: Bluesky, Mastodon, public Telegram channels, YouTube (key), X via official API (token);
       party/institution channels; curated `social_accounts.yaml`
+- [x] X deletion sync (`social.x_deletions`): posts gone from X keep a marked record without their text
 - [x] Pages: organisations, money explorer, social feed, Wikipedia edits, person network ("follow the money"),
       say-vs-vote on roll calls
 
@@ -43,7 +44,6 @@ Next.js frontend (de/en), Docker Compose for Unraid.
 ## Next
 
 **Data**
-- [ ] X deletion sync (Developer Agreement: remove posts deleted on X) – required before enabling `social.x` in production
 - [ ] Full speech texts and interjections from the protocols; committee memberships (list 250)
 - [ ] HowTheyVote.eu / EP roll-call votes of Austrian MEPs
 - [ ] EU Council participant lists, ministries' press releases, Federal President's schedule