feat(feedback): add diff_banner primitive

[ty13r]

Summary

Rebased onto current main and reduced the branch to the missing canonical integration pieces for diff_banner as a baseline feedback primitive.

• Adds UnifiedIUR.Widgets.Feedback.diff_banner/1 with counts, active filter, size, base label, and canonical filter_intent/selection_intent support under attributes.diff.
• Wires Ash UI resource admission plus IUR and fallback Live UI adapters without adding a widget-component catalog entry.
• Adds native Live UI rendering with canonical interaction attrs, plus Desktop UI and Elm UI renderer mappings so package consumers can handle the new canonical kind.
• Updates fixture/tooling/docs coverage and adds tests that explicitly keep :diff_banner out of UnifiedUi.WidgetComponents, UnifiedIUR.Widgets.Components, and AshUI.WidgetComponents.

Architecture Notes

diff_banner is treated as a baseline feedback widget, not as a UnifiedUi.WidgetComponents catalog component and not as a new workflow/status family member.

The filter interaction no longer uses a filter_intent_prefix or raw phx-click="live_ui_interaction". Renderers synthesize canonical selection interaction attributes from filter_intent or selection_intent, preserving the existing transport architecture.

The visual behavior is stable and simple: all/new/changed/removed chips are always present, compact mode hides only the optional base_label, and static mode renders chips without radio semantics.

Verification

Passing:

• mix format --check-formatted <changed files>
• git diff --check -- . ':(exclude)_build/**' ':(exclude)deps/**'
• mix test packages/unified_iur/test/unified_iur/widgets/diff_banner_test.exs packages/unified_iur/test/unified_iur/widgets_test.exs packages/unified_iur/test/unified_iur/fixtures_test.exs packages/unified_iur/test/unified_iur/tooling_test.exs packages/live_ui/test/live_ui/widgets/diff_banner_test.exs packages/live_ui/test/live_ui/renderer_test.exs test/ash_ui/resource/diff_banner_test.exs test/ash_ui/phase_31_runtime_adapter_test.exs test/ash_ui/phase_31_package_boundary_test.exs packages/desktop_ui/test/desktop_ui/renderer_test.exs packages/elm_ui/test/elm_ui/renderer_test.exs (65 tests, 0 failures)

Additional check:

• mix test packages/desktop_ui/test/desktop_ui/phase_eleven_integration_test.exs still has the existing release-readiness failure in traceability_alignment because the required .spec/specs/desktop_ui/* and .spec/planning/desktop_ui/spec-traceability.* files are absent on current main. The widget coverage assertions pass before that readiness assertion.

Spec loop tasks are not wired in this checkout: mix spec.prime --base HEAD, mix spec.next, and mix spec.check --base HEAD all report missing Mix tasks.

[pcharbon70]

Cleaned up PR #126 as discussed.

• Rebased the branch onto current main (be09413) and force-pushed a single replacement commit: c381964 feat(feedback): add diff banner primitive.
• Removed the stale widget-component catalog direction from the PR: diff_banner is now a baseline feedback primitive, with explicit tests proving it is not in UnifiedUi.WidgetComponents, UnifiedIUR.Widgets.Components, or AshUI.WidgetComponents.
• Replaced filter_intent_prefix / raw live_ui_interaction handling with canonical selection interaction attrs generated from filter_intent or selection_intent.
• Added the missing package integrations for Live UI, Ash UI adapters, Desktop UI, and Elm UI.

Verification:

• mix format --check-formatted <changed files>
• git diff --check -- . ':(exclude)_build/**' ':(exclude)deps/**'
• Targeted test set: 65 tests, 0 failures

Caveat: packages/desktop_ui/test/desktop_ui/phase_eleven_integration_test.exs still fails only at the existing traceability_alignment release-readiness assertion because the required .spec/specs/desktop_ui/* and .spec/planning/desktop_ui/spec-traceability.* files are absent on current main as well. The widget coverage assertions pass.