fix(codegen-ts): stripPackage relationship @objectRef in projection join resolver

[dmealing]

Problem

A projection aggregate that traverses a relationship whose @objectRef is
package-qualified (pkg::Entity) silently dropped the join — and with it
every aggregate column traversing that join — leaving the generated view with
only PK + passthrough columns. No error; the view just degraded.

Root cause

buildJoinTree (extract-view-spec.ts) resolved the relationship target with
root.findObject(targetName) on the raw @objectRef, but findObject keys on
the bare name (which is why the @via / @of / @from paths already
stripPackage first). The directory loader qualifies a same-package @objectRef
even when authored bare (Week → acme::Week), so real directory-loaded models hit
this while the existing string-loaded test fixture (bare objectRef) did not — the
qualified path was never exercised.

When the target failed to resolve, the join path breaks out empty, so the join tree
has no entry for that relationship; buildSelectSpec then continues past any
aggregate whose @of/@via entity isn't in the join tree.

Fix

stripPackage(targetName) before findObject, matching the sibling resolution paths.

Tests

• New regression test under buildProjectionViews — package-qualified relationship @objectRef: a projection over a relationship with a package-qualified @objectRef
  asserts the inverse-FK LEFT OUTER JOIN + COUNT(DISTINCT …) AS week_count survive.
  Red before the fix (view emitted PK only), green after.
• Full codegen-ts suite green (865 tests).

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