R1 cleanup: collAnon and dead code gone, docs current, every peer's scenario in one sweep

Starts the completion program (docs/ROADMAP.md, "Owner decisions on finishing everything", 2026-10-17).

- Dead code: the commented-out collAnon blocks (discussions, seeding, admin user lists, HTTP/3, the old signature
  middleware), the empty PrivaPubWorkersConfiguration, PublicAvatarUsersService and UserPolicyType, unused helpers,
  the second IPasswordHasher registration, the PasswordGenerator package, SignUpAsync/LoginAsync's unused invitation
  parameters. "Starting PrivaPub"; a signed-in login is sent to "/", not to "/discussions".
- Stored fields nothing read: RootUser.Contacts and ResetPasswordToken*, the local Avatar.AvatarServer,
  EmailRecovery.RecoveryCode/RequestIP/CreationDate, MongoSettings.LogsDatabase, and AppConfiguration's
  upload/discussion keys, RequiresFirstTimeSetup and Version (old documents still load: MongoDB.Entities ignores extra
  elements). DmPost's indexes are no longer made. 49 collAnon keys leave FieldsNameResource in every language.
- /clientapi/data/current-version answers the build's ref. UsersIds is a list that can't throw, and the admin routes
  leave the administrator out without mutating the request.
- deploy.yml checks SecureMode on a name no persona can have, and the browser redirect on the directory's first local
  persona: @thepra is the administrator's own now.
- Town: decePub's e2e remnants (expect, client.jsonl, the decePub column) and town/tests go; the dead gaps/load
  commands too. Mobilizon no longer keeps an event for a deleted test.
- tools/pasture/sweep.sh runs every peer's scenario, batch by batch, as CLAUDE.md asks before a change to what
  PrivaPub sends.
- Docs: CLAUDE.md's repo map, route table (every frozen route) and stale lines; ROADMAP's status (setup, v1.25.0,
  v1.26.0, the program C), the 2026-10-17 decisions, and dated notes where earlier text no longer holds; FEDERATION.md's
  FEP list (7888, f228, 7628, ae0c and 8967 supported) and the deploy's persona.

Verified: dotnet build PrivaPub.sln -c Release (0 errors, no new warnings); bash -n on the touched scripts; py_compile
on the town; the pasture's gts, mastodon and lemmy scenarios on this build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WpVCoDeM1qUTRp4fXQdfof

FEDERATION.md

@@ -65,8 +65,8 @@ Checked both ways, where the peer has the feature:
 - communities and circles;
 - blocks and unfollows.
 
-`docs/INTEROP.md` has each peer's evidence and what is still expected to fail. The platforms not yet in the pasture are
-covered by unit tests written in their documents' shape.
+`docs/INTEROP.md` has each peer's evidence and what is still expected to fail. The platforms not in the pasture are
+read from documents in their published shape (`docs/INTEROP.md` records each one); there is no test project.
 
 ## Supported FEPs
 
@@ -98,10 +98,19 @@ covered by unit tests written in their documents' shape.
   (sent and honoured; see "Followers synchronisation")
 - [FEP-5624: Per-object reply control policies](https://codeberg.org/fediverse/fep/src/branch/main/fep/5624/fep-5624.md):
   read (see "Replies its author approves")
+- [FEP-7888: Demystifying the context property](https://codeberg.org/fediverse/fep/src/branch/main/fep/7888/fep-7888.md)
+  and [FEP-f228: Backfilling conversations](https://codeberg.org/fediverse/fep/src/branch/main/fep/f228/fep-f228.md):
+  a root post serves its `context` collection, and a remote thread is read from its `context` (or `contextHistory`)
+  before its `replies` (see "Activities")
+- [FEP-7628: Move actor](https://codeberg.org/fediverse/fep/src/branch/main/fep/7628/fep-7628.md): received; a persona's
+  follows move with the account (see `Move` under "Activities")
+- [FEP-ae0c: Fediverse Relay Protocols](https://codeberg.org/fediverse/fep/src/branch/main/fep/ae0c/fep-ae0c.md): the
+  instance actor follows the relays configured, and their `Announce`s are taken as their origin vouches (see "Relays")
+- [FEP-8967: Generic attachments, link previews](https://codeberg.org/fediverse/fep/src/branch/main/fep/8967/fep-8967.md):
+  received; a `preview` builds the card
 
-Planned (see `docs/ROADMAP.md`, phases P7 and P8, and the per-platform notes in `docs/INTEROP.md`): FEP-9098 (custom
-emoji), FEP-7888 and FEP-f228 (threads), FEP-7628 (Move), FEP-8967 (link
-attachments), FEP-ae0c (relays).
+Planned (see `docs/ROADMAP.md`, the completion program, and the per-platform notes in `docs/INTEROP.md`): FEP-9098
+custom emoji offered (R7) and FEP-8967 link attachments sent (R10).
 
 ## Actors
 
@@ -128,7 +137,7 @@ The names are the project's own and are stable; resolve actors through WebFinger
 - The key is `{actor}#main-key`, RSA 2048, served as SPKI PEM with `owner` set to the actor.
 - `published` on an actor is a whole day, chosen at random up to two weeks before the account was made, so two
   personas made on the same day do not share a date. `indexable` is `false` unless the persona turns it on, and
-  `discoverable` is `true` unless it turns that off (the deploy's own persona, @thepra, is undiscoverable).
+  `discoverable` is `true` unless it turns that off.
 - The instance actor is `/peasants/privapub` (type `Application`). It signs every fetch PrivaPub makes, so no avatar's key
   is used to read another server's content. It also answers at the server's root (`/`) for a request that asks for
   ActivityPub, as Lemmy's site actor does: PieFed sends a community's announces to the inbox of the Application at a