fix(core): coalesce orphan-tx warnings in ModelDb.addTxes

[MichaelUray]

Summary

ModelDb.addTxes currently emits one ctx.warn('no document found, failed to apply model transaction, skipping') for every orphan-targeted transaction the loader skips. On workspaces that have evolved through multiple model versions this produces dozens of identical-looking warnings on every page load, drowning out real warnings without giving operators an actionable signal.

Change

Drop the three per-tx ctx.warn(...) calls in the create/update/remove branches; accumulate the orphan count plus a transaction-class breakdown locally, then emit a single coalesced ctx.info at the end of addTxes:

message: skipped model transactions for orphan documents
args: { total: 4, byClass: { "core.class.TxUpdateDoc": 3, "core.class.TxRemoveDoc": 1 } }

The diagnostic information needed for migration debugging is still present — just consolidated into one log line per call instead of M.

Why info instead of warn

Orphan-targeted transactions on long-lived workspaces are an expected outcome of model evolution (objects renamed/removed across versions). They are not actionable for operators on each load. warn is reserved for events that need attention.

Tests

memdb.test.ts adds focused coverage for the coalescing behaviour:

• a batch with multiple orphan-targeted transactions emits one coalesced ctx.info record
• the total count and concrete byClass breakdown (TxUpdateDoc / TxRemoveDoc) are asserted
• legacy per-transaction no document found warnings are no longer emitted
• a clean addTxes call (no orphans) emits no orphan summary

DCO

Signed-off-by Michael Uray. maintainer_can_modify=true.

[huly-github-staging]

Connected to Huly®: UBERF-16530