chore: harden repo CI, docs, license and native logging

[joshuakrueger-dfx]

Closes #27

Repo hardening across CI, tests, docs, license and native error logging. Each item from #27 addressed; scope kept tight and consistent with the existing project conventions.

High priority

• Build native code in CI — pull-request.yaml gains two jobs alongside the existing flutter/go/yaml-lint: android (ubuntu, JDK 17, flutter build apk --debug of example/) and ios (macos-latest, flutter build ios --no-codesign of example/). A native-only change can no longer pass every check while breaking the consuming app's build.
• Drop stale template tests — removed the flutter create leftovers that exercised a getPlatformVersion the plugin never implements: the Android Kotlin test (wrong package com.cakewallet.bitbox) and the iOS RunnerTests.swift, including a clean removal of the RunnerTests target from the Xcode project, scheme and Podfile (no dangling refs). The now-orphaned JUnit5/mockito wiring in android/build.gradle is removed too. For consistency the identical macOS template stub (test + the template getPlatformVersion handler) is removed as well.
• Real LICENSE — MIT (consistent with the DFXswiss org); reflected via the LICENSE file (pub derives the license from it).

Medium priority

• Real README — documents what the plugin does, supported device (BitBox02) and chains (BTC/LTC/ETH/ERC20), the Dart ↔ native ↔ Go (gomobile) layering, and how the bindings are rebuilt (run_build_tool_android.sh, ffigen_config.yaml). Every referenced API verified against source.
• pubspec metadata — real description, plus homepage/repository/issue_tracker.

Low priority

• CHANGELOG — real entries for 0.0.1–0.0.8 (matches the existing tags), reconstructed from git history.
• Native error logging — the three Android operations that caught and swallowed exceptions (InitBitBoxOperation, CloseOperation, ConnectBitBoxOperation) now emit Log.w("bitbox_flutter", ...) on the error path; no behaviour change.

Out of scope per the issue: no full native unit-test coverage, vendored gomobile artifacts left as-is.

Verification (local, Flutter 3.41.6 — the CI pin)

• dart format clean · flutter analyze --fatal-infos clean · flutter test 11/11
• go vet + go test green
• flutter build apk --debug (example) → built app-debug.apk
• flutter build ios --no-codesign (example) → built Runner.app
• flutter build macos --debug (example) → built, confirming the macOS project edits compile
• workflow YAML parses (the repo's own yaml-lint check)

[joshuakrueger-dfx]

@marassteiner Review request — formal GitHub reviewer assignment is not available for this repo (collaborator permission). Please review when you can.

[marassteiner]

EN: Working on this now — job dfxswiss__bitbox_flutter__28__pr-review.
DE: Ich arbeite jetzt daran — Auftrag dfxswiss__bitbox_flutter__28__pr-review.

[marassteiner]

Recommendation: Approve

No merge-blockers identified. CI is green (Flutter analyze+test, Go tests, YAML lint, Android example build, iOS example build). Follow-up items only — filed as issues and linked below.

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Gate A — Diff review (Konformität + Logik)

Two independent reviews of origin/develop...HEAD (6a45c97 vs merge-base 6d70a85).

Behavior / correctness (no blockers)

Area	Verdict
InitBitBoxOperation.kt / CloseOperation.kt / ConnectBitBoxOperation.kt	Control flow unchanged; only Log.w("bitbox_flutter", …) on existing error paths. No seed/key/serial in log strings.
Template test removal (Android/iOS/macOS)	Dead getPlatformVersion flutter-create stubs only; no product coverage lost. No dangling RunnerTests refs left in pbxproj/schemes/Podfiles.
macOS getPlatformVersion drop	Consistent with Android/iOS bridges; not part of the Dart platform API.
New CI jobs	Plausible (example/, Flutter 3.41.6, APK debug / iOS --no-codesign).
LICENSE / README / pubspec metadata	Appropriate hardening; README APIs checked against BitboxUsbPlatform.

Follow-up findings (not merge-blockers)

1. Docs drift — CONTRIBUTING PR gate table
   CONTRIBUTING.md:13-19 still says three jobs and documents flutter analyze --no-fatal-infos, while the workflow now has five jobs and already uses --fatal-infos.
   → #36

2. Branch lag / CHANGELOG vs develop
   PR rewrites CHANGELOG.md from 0.0.8 downward; develop already has 0.0.9 / 0.0.10 (#29/#30). merge-tree: CHANGELOG.md changed in both. Rebase before merge and keep the union of both histories. pubspec.yaml:3 remains 0.0.1 (pre-existing vs tags through v0.0.10).
   → #37

3. No macOS CI for macOS native edits
   Android/iOS example builds added; macOS plugin + Xcode cleanup still unguarded in CI.
   → #38

Note on severity: One review lane initially labeled the CONTRIBUTING / version-metadata gaps as merge-blockers. Against the project merge-blocker bar (production harm, security, red CI, mandatory CONTRIBUTING violation that takes effect on merge), both are documentation / process items only — hence follow-up, not request-changes.

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Gate B — Local software run

Host: review machine with Flutter SDK at /Users/dfxai/sdk/flutter (3.44.9; CI pins 3.41.6).

Command	Result
flutter pub get	OK
dart format --set-exit-if-changed …	OK (0 changed)
flutter analyze --fatal-infos	OK — no issues
flutter test	OK — 11/11
go vet ./... + go test -race -timeout 60s ./... (in go/)	OK — api + u2fhid
cd example && flutter build apk --debug	Skipped (env) — no Android SDK / ANDROID_HOME on this host
cd example && flutter build ios --no-codesign	Skipped (env) — Xcode not installed (CLT only; “Application not configured for iOS”)

Native-build failures are Case 2 (environmental): host lacks Android SDK and Xcode; the PR does not introduce that dependency gap, and GitHub Actions already passed both new jobs on this PR. Core plugin gate (format / analyze / unit tests / Go) exercised successfully here.

CI (remote, all pass): Android example build, iOS example build, Flutter analyze + test, Go unit tests, Workflow YAML lint.

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Summary

Approve. Please rebase onto current develop before merge so CHANGELOG keeps 0.0.9/0.0.10 (#37). Follow-ups: #36, #37, #38.