docs: correct the stale claims in README and AGENTS

[Siddhesh2377]

The docs had drifted from the app. Every claim below was checked against the code before changing it.

What was wrong

• SDK version said 0.20.18 in three places. libs.versions.toml, app/gradle.lockfile and verification-metadata.xml all say 0.20.19.
• The Kotlin SDK link pointed at tree/main/sdk/runanywhere-kotlin, a path that stopped existing at the 0.20.17 restructure. It is bindings/kotlin now.
• runanywhere-onnx was described as registering Sherpa only. It registers ONNX Runtime for embeddings and Sherpa for STT/TTS/VAD, per the isSherpaRegistered path in ONNX.kt.
• The features table listed 10 entries, missed 8 real screens, and named two that do not exist. Model management is ModelSelectionSheet; storage is a Settings section.
• The QHexRT setup step sent readers to Settings then Downloads. The HF token field is under Private Downloads. Both sections exist, which made the old instruction actively misleading.
• Requirements named Android Studio Ladybug, which is 2024.2 and cannot build AGP 9.2.1, and omitted the JDK 21 daemon toolchain that gradle-daemon-jvm.properties pins.
• The project tree used the wrong root name and omitted tools/, download/, MainActivity.kt, both lockfiles and ci.yml.
• LICENSE linked to the monorepo. This repo has its own, and it is the RunAnywhere License v1.0, not plain Apache 2.0.

What was added

The RUNANYWHERE_BASE_URL / RUNANYWHERE_API_KEY both-or-neither rule, which fails the configuration phase and was documented nowhere. In AGENTS.md: the per-variant ABI filters, the backend registration ordering constraint (CPU backends before initialize() or you get -422, QHexRT after), and a note that smoke.sh is a grep over source text and proves nothing about compilation.

Not changed

Three stale references live in source files, not docs, so this PR leaves them:

• .github/workflows/ci.yml header comment says 0.20.18.
• SolutionsYaml.kt points at two pre-0.20.17 monorepo paths and a script absent from this repo, so its "regenerate via" instruction fails if followed.
• ui/theme/Color.kt and res/values/colors.xml reference examples/DESIGN_GUIDELINE.md, now docs/DESIGN_GUIDELINE.md.

Worth a separate look

This app declares runanywhere-qhexrt-android as a plain implementation dependency and records its checksums for 0.20.17 through 0.20.19 in verification-metadata.xml, which Gradle only writes for artifacts it actually downloaded. The monorepo's package-sdk.sh hard-fails on any *qhexrt* input and release.yml errors with "Private QHexRT artifacts must not be present in the public release". So either the guard misses the publishing path, or a private artifact is publicly resolvable. The docs here describe the observed behavior. Someone should confirm which it is.

Documentation only. No source changes.

[coderabbitai]

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