fix(daemon): replace synced store with synced export tables under peer formulaand retain sent formulas

[kumavis]

Refs: (no linked issue)

Description

This PR changes cross-peer retention bookkeeping so it is attached to each
peer formula and no longer modeled as user-visible inventory data.

The goal is to retain formulas for objects exported to a peer (including when
that object is not saved in the local pet store), while keeping retention rows
out of normal user-facing name APIs.

What changed

• Peer formulas can now record their synced-store dependency via an optional
  syncedStore field.
• Invitation setup records the synced-store on the peer formula and stores
  bootstrap handles under hidden internal names (@peer-handle,
  @self-handle).
• Mail send/reply/sendValue paths now call a host hook
  (trackSentIdentifiers) so locally sourced identifiers sent to a peer are
  retained in that peer's synced store.
• Hidden export-retention rows use objective, deterministic names derived from
  the exported identifier (@export-...) instead of subjective counters.
• synced-pet-store supports internal (non-pet) names for writes/removals, but
  list() remains user-facing and returns only pet names.
• Synced-store controller user APIs filter internal names, while GC seeding uses
  full synced-store state (including hidden rows).

Files touched

• packages/daemon/src/daemon.js
• packages/daemon/src/host.js
• packages/daemon/src/mail.js
• packages/daemon/src/store-controller.js
• packages/daemon/src/synced-pet-store.js
• packages/daemon/src/types.d.ts
• packages/daemon/test/synced-pet-store.test.js
• packages/daemon/test/synced-pet-store-integration.test.js

Testing

Executed:

• npx corepack yarn workspace @endo/daemon ava test/synced-pet-store.test.js test/synced-pet-store-integration.test.js --timeout=120s

Added/updated coverage for:

• grantee writes to hidden internal synced-store entries
• hidden entries excluded from list()
• send path retention rows being created and synchronized as hidden entries

Compatibility notes

• SyncedPetStore.list() intentionally exposes only regular pet names.
• Internal retention/bootstrap rows remain replicated and GC-relevant, but are
  not surfaced in user inventory listings.
• Type signatures for synced-store write/remove accept Name so internal rows
  can be represented explicitly.

  

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