L02-05: Prove Editor and headless receipt adapter parity

[mberrys]

Both presentation adapters now consume the same admitted DocumentFacade snapshot and Core inspection receipt. The Editor renders the receipt's verdict, coverage, limitations, finding IDs and available intents; the headless adapter emits matching text from the same typed projection. No adapter parses a report or reduces a verdict.

Closes #26.

Stacked on #189 at 309888d641efd0b34d5d44bf2ae8b3b6179eb523, as approved. Merge #189 first; this PR's diff contains only #26.

Changed files: the Interaction presentation header, Editor host/QML and its smoke mirror, facade tests, product smoke/fixture helper, and required change/evidence fragments.

Validation source: 52fa0d012a734592679a88583e78ab3710b6a79c.

• Final model proof: 51 cases passed, none failed/skipped.
• Shared Pass/Fail/Incomplete/Error fixture comparisons passed in the Windows rendered smoke. The Incomplete fixture deliberately has a legacy Pass result but an Incomplete Core receipt; adapters preserve Core's stricter answer.
• Tests cover absent/running snapshots, stale revision and pending output, selected finding and plan-intent availability.
• Exact-commit Windows screenshot/text capture passed for all four verdicts, with visible-bounds assertions and visual inspection of the Incomplete screenshot. The complete mapped check-change gate passed on this commit: all 20 mapped test targets, affected builds, formatting, static analysis, source guards and architecture contracts.

Commands, with the existing approved temporary build and Qt/MSVC runtime:

python scripts/agent/check-change.py --base 309888d641efd0b34d5d44bf2ae8b3b6179eb523 --build-dir "$env:TEMP/loop-issue24-build" --report "$env:TEMP/loop-issue26-final-check-change-52fa0d01.json"
$env:QT_QPA_PLATFORM = "windows"
$env:QT_QUICK_BACKEND = "software"
$env:LOOP_PARITY_SOURCE_SHA = "52fa0d012a734592679a88583e78ab3710b6a79c"
& "$env:TEMP/loop-issue24-build/usr/bin/ProductQuickAccessibilitySmoke.exe" --receipt-parity "$env:TEMP/loop-issue26-parity-final-52fa0d01"
& "$env:TEMP/loop-issue24-build/usr/bin/UnitTestsDocumentFacade.exe" -o "$env:TEMP/loop-issue26-model-final-52fa0d01.txt,txt"

Scope/limits: fixtures are synthetic Core evidence bound to a real opened one-page PDF, not PDF inspection qualification. This proves adapters over admitted snapshots; migrating existing preflight job orchestration to the new facade lifecycle is outside this issue. Linux/macOS screenshots and assistive speech were not tested. The hosted CI/CodeQL workflows target dev/unstable/stable and are not scheduled for this stacked base; they must run after the parent merges and this PR is retargeted. Native Windows capture is used because the offscreen platform produced missing-font boxes.

Quality review: the full diff was reviewed for duplicated verdict/policy logic, redundant checks, explanatory comments and unnecessary wrappers. Shared projection code reads the accepted receipt and existing facade intent predicates; adapter-specific code only changes presentation shape.

Exact receipt SHA256 values from the final Windows capture (each matches its saved canonical receipt JSON):

Verdict	Receipt SHA256
Pass	90e286f4bb5ef28368bae09254257023f27cd252c6825731d08350bbb212119e
Fail	cc7bfd92363a7651fe60c7f0db75f1a2bf3ff52e43f341b02ddcb181ae32c0b5
Incomplete	47a0aef7c5549e14dc3d47c3ac6e20d9d3928940bd81978f268d18e7b7546638
Error	0d521dc0399c7421f27b2b815fa64de16a98e8e05a7c7385b2927b53bbe2c5e4

Inspected smoke executable SHA256: B17064AB33B3C1133E14070C7488E1CCAD5C259A758B18AC4047FC4D22F00BA6.
Local artifact directory: %TEMP%/loop-issue26-parity-final-52fa0d01; contains adapter-parity.json, the PDF fixture, four canonical receipt JSON files, four headless text files and four Editor PNG captures. Model log: %TEMP%/loop-issue26-model-final-52fa0d01.txt.