Postbox -> TelegramEngine waves 107-137 (squashed)

31 waves of consumer-side migration from `import Postbox` to TelegramEngine
typealiases. Net: 173 import drops + 39 BUILD-dep drops + 1 new typealias
(`EngineStoryId = StoryId`, wave 113).

Wave shapes used:
- Orphan-import sweeps (107, 108, 128): drop `import Postbox` from files
  whose only Postbox-symbol reference was the import line itself, then
  resolve build failures. Methodology requires token-level (`grep -oE`)
  filtering, not line-level, to avoid masking real Postbox usage on lines
  that also contain `Namespaces.X` references.
- Identifier-swap mini-waves (109-127, 129-134, 136-137): rename
  Postbox-typealiased identifiers to engine equivalents
  (PeerId -> EnginePeer.Id, MessageId -> EngineMessage.Id,
  MediaId -> EngineMedia.Id, MessageIndex -> EngineMessage.Index,
  StoryId -> EngineStoryId, ItemCollectionId -> EngineItemCollectionId,
  PreferencesEntry -> EnginePreferencesEntry,
  FetchResourceSourceType/Error -> EngineFetchResourceSourceType/Error,
  MemoryBuffer -> EngineMemoryBuffer, MessageTags -> EngineMessage.Tags,
  MessageAttribute -> EngineMessage.Attribute,
  TempBox -> EngineTempBox).
- Asset-string FP-only orphans (124).
- Typealias addition + drain (113): added `EngineStoryId` typealias to
  TelegramCore, then drained 3+11 consumer sites.

Hard blockers identified during these waves (must restore `import Postbox`
when present): MediaResource[A-Za-z]* (any suffix -- the literal
`MediaResource` matches don't catch MediaResourceData/MediaResourceId/etc.),
Postbox/MediaBox/MediaResource raw types, PostboxCoding/PostboxEncoder/
PostboxDecoder, TempBoxFile, ValueBoxKey, PostboxView, combinedView,
HashFunctions, postboxLog, openPostbox, declareEncodable, PeerView,
MessageHistoryView, MessageHistoryThreadData, CachedPeerData, RenderedPeer,
SelectivePrivacyPeer, SimpleDictionary, ItemCollectionInfosView,
ItemCollectionItem, ItemCollectionItemIndex, ItemCollectionViewEntryIndex,
ChatListIndex, ChatListEntrySummaryComponents, CodableEntry,
MessageHistoryThread, MessageHistoryAnchorIndex,
MessageHistoryEntryLocation, PeerStoryStats, PeerNameIndex,
PeerSummaryCounterTags, ChatListTotalUnreadStateCategory/Stats,
arePeersEqual. Protocol-shape blockers: bare `Peer`/`Message`/`Media`
in function signatures, generic args, enum-case payloads, or dict value
types (e.g., `[PeerId: Peer]`, `case messages([Message])`,
`Signal<(Peer?, ...), NoError>`).

`replace_all PeerId -> EnginePeer.Id` is dangerous: mangles compound
names like `failedPeerId`, `ContactListPeerId`, `nextRemoteMediaId`,
`replyToMessageId`. Pre-flight grep `\b[a-z][a-zA-Z]*PeerId\b` and only
replace_all if 0 matches.

Also removes unneeded design/plan docs from a separate (link-highlighting)
feature branch:
- docs/superpowers/plans/2026-05-02-link-highlighting-modern-path-fixes.md
- docs/superpowers/specs/2026-05-02-link-highlighting-modern-path-fixes-design.md

Squashed commits: 6d82c2980d..e6de5d53a3 (59 commits, including
per-wave content commits and per-wave CLAUDE.md bumps).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -41,7 +41,7 @@ A gradual migration is underway to eliminate direct `import Postbox` from consum
 
 **Historical record:** Wave-by-wave outcomes, the running tally of Postbox-free modules, and full verbose forms of the guidance subsections below live in [`docs/superpowers/postbox-refactor-log.md`](docs/superpowers/postbox-refactor-log.md). Read that file when you need wave-specific context, a full worked example of a pattern, or the history of a particular module's migration.
 
-Waves landed so far (as of 2026-04-24): 45 waves plus standalone cleanups. See the log file for per-wave detail; the list of still-open migration opportunities lives in the `project_postbox_refactor_next_wave.md` memory file.
+Waves landed so far (as of 2026-05-02): 137 waves plus standalone cleanups. See the log file for per-wave detail; the list of still-open migration opportunities lives in the `project_postbox_refactor_next_wave.md` memory file.
 
 ### Rules that apply to every wave
 
@@ -74,6 +74,7 @@ AdaptedPostboxDecoder → EngineAdaptedPostboxDecoder (added 2026-04)
 ItemCollectionId    → EngineItemCollectionId       (added 2026-04-20)
 FetchResourceSourceType → EngineFetchResourceSourceType (added 2026-04-20)
 FetchResourceError  → EngineFetchResourceError     (added 2026-04-20)
+StoryId             → EngineStoryId                (added 2026-05-02)
 ```
 
 For the `MediaResource` Postbox protocol, prefer the TelegramCore subtype `TelegramMediaResource` when the consumer's usage allows (note: `EngineMediaResource` is a wrapper **class**, not a typealias, so it is not interchangeable with the protocol).