Prepare v0.4 release and open source docs

docs/FUNCTIONALITY_AUDIT.md

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+# Functionality Audit
+
+Date: 2026-06-29
+
+## Current Build Scope
+
+I Hate PDFs v0.4 is a small native macOS PDF reader and annotation app. The shipping scope is:
+
+- Local PDF opening, recent documents, drag/drop, close-current-PDF, and focused reader startup.
+- PDFKit reading, page navigation, zoom, fit controls, search, and responsive sidebars.
+- Highlights, underline comments, selected-text comments, free text, replies, review state, filters, grouped comments, bookmarks, and highlight sorting.
+- Settings for highlight and comment colors.
+- Save, Save As, native Share, overwrite warnings, unsent reply-draft warnings, and empty temporary annotation cleanup.
+- Lightweight release packaging with `.app`, `.dmg`, tiny per-architecture archives, and App Store package scripts.
+
+## Removed Scope
+
+The experimental Fill & Sign and PDF signing work has been removed from source, tests, scripts, settings, menus, and release docs for v0.4. This includes custom flat fill marks, form-field scanning/navigation, form choice editing, Keychain-backed PDF signing, signature validation/inspection, and signed-document save branching.
+
+## Verification
+
+Run before release:
+
+```sh
+swift build
+swift test
+swift scripts/verify-sample-pdf.swift
+swift scripts/verify-pdf-annotations.swift
+scripts/build-app.sh
+scripts/make-dmg.sh
+scripts/make-tiny-archives.sh
+scripts/verify-release-artifacts.sh
+```
+
+Manual QA remains documented in `docs/QA.md`.