Bump JasperFx to 2.28.0; declare EventProjection doc types for rebuild teardown (#4685 COPY)

[jeremydmiller]

Lands the JasperFx 2.27.0 → 2.28.0 bump and fixes a pre-existing binary-COPY rebuild bug that 2.28.0 unmasks.

What 2.28.0 brings

• Do no schema verification checks if AutoCreate == None #524 — HighWaterAgent treats IDaemonWakeup as untrusted (guards every WaitAsync in the poll loop) and the restart watchdog observes the real unwrapped loop task, so a wakeup throw can't permanently freeze projection progress and a faulted loop self-heals. (Completes the defense-in-depth behind the PostgresqlListenWakeup fix in fix(#4961): PostgresqlListenWakeup falls back to a timeout wait when the DB is unreachable #4965 / Async daemon stops projecting permanently after a brief DB outage when UseListenNotifyForEventAppends is enabled — HighWaterAgent loop dies and is never restarted #4961.)
• Environment check support #525 — opt-in deferred single-flush rebuild writes, default off (no behavior change).
• 1.0.0 nuget issue "Unable to resolve dependency 'Baseline'. #522 — TimeoutAfterAsync no longer swallows a rebuild fault.

The pre-existing bug #522 surfaced

rebuild_with_bulk_copy_inserts (the #4685 binary-COPY rebuild tests) began failing with 23505 duplicate key. Root cause, confirmed with a direct detector run at V2.27.0, #480, and 2.28.0 (the collision fires at all three — 2.27.0 just swallowed the fault, so the test passed falsely):

An EventProjection writes documents via ad-hoc ops.Insert/ops.Store, so Marten cannot infer which document types it produces and never wiped them on rebuild. The per-row path tolerated stale docs (re-insert upserts), but the INSERT-only binary COPY rebuild assumes a truncated table and collides. This is a long-standing EventProjection limitation, not a regression, and (per maintainer direction) not something we change — an EventProjection must declare the types it writes.

Fix

• The affected test projections declare their written type: Options.DeleteViewTypeOnTeardown<BulkCopyDoc>(), so the rebuild TRUNCATEs it first.
• docs/events/projections/event-projections.md documents the requirement (and that INSERT-only COPY rebuilds require it).

Verified: all 9 rebuild_with_bulk_copy_inserts tests pass against the published JasperFx.Events 2.28.0 (net10.0).

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