fix(layout): respect native maximum window heights

[qeude]

Summary

Dia could retain a temporarily short native frame instead of filling its tile. Only windows with a current native maximum height may retain accepted compact sizes, preserving Device Hub previews.

fresh native maximum height absent -> discard acceptance; fill tile height
fresh native maximum height present -> accepted native size may shape the tile

Height constraints are not carried over from an old snapshot or window ID. Existing learned width constraints remain unchanged.

Evidence

• Before: lifecycle regressions fail when all native constraints disappear or an unbounded replacement inherits a stale maximum height.
  After: both cases clear the height capability; the all-nil transition clears accepted sizing and restores full tile height.
• Height-only snapshots preserve learned minimum and maximum width bounds; the regression failed before the fix and passes afterward.
• python3 script/verify.py local --stage: build, all non-desktop Swift tests, workflow tests, and staging passed.
• Focused native test DesktopE2ETests/testAppliedTargetConvergesWithRealWindowFrame: passed with Accessibility available; desktop session restored.
• Desktop validation of the original fix: Dia fills 1,363 points; Device Hub preview remains 338 × 748.

Merge Danger

Door: two-way

Blast Radius: tiling

If optional native constraints are unavailable, compact acceptance is discarded and full tile height is requested.

Note

Respect native maximum window heights in tiled layout

• Windows without a native maximum tiled height no longer learn or use tiled-size acceptance, so unbounded windows keep their full requested height instead of shrinking to a stale compact frame.
• The window-server constraint lookup now returns width and height limits as one WindowSizeConstraints value, and the Window model gains an optional maximumTiledHeight carried through discovery in SnapshotEngine.makeWindow (WindowBorderPrivateProviders.swift, Window.swift).
• Reconciliation clears stored acceptance when the height capability disappears or the window goes fullscreen, and preserves learned width bounds when a new snapshot supplies only a height limit (WindowReconciliation.swift).
• Behavioral Change: acceptedTiledSizes and acceptTiledWindowFrame now require a maximum tiled height; stale accepted sizes from unbounded windows are ignored (Layout.swift, RuntimeState.swift).

^{Macroscope summarized 4b7df31.}

[cubic-dev-ai]

All reported issues were addressed across 9 files

<sub>Reply with feedback, questions, or to request a fix.

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[macroscopeapp]

Approvability

Verdict: Approved at 4b7df31

Macroscope's review found this PR approvable — This is a focused, well-scoped fix to native window-size handling, with additive state propagation and targeted lifecycle/layout regression coverage. Its runtime effect is limited to discarding stale compact sizing for windows without a current native height bound while preserving existing width behavior.

^{You can add or adjust custom eligibility rules. Learn more.}

[cubic-dev-ai]

All reported issues were addressed across 3 files (changes from recent commits).

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>