refactor: rebuild agentic webview as modular SDK

[shanthropic]

Summary

This is the complete breaking refactor of the prototype Agentic WebView into a modular, framework-neutral Android browser SDK. It intentionally removes the prior controller API and adds no compatibility layer.

What changed

• Split the project into platform-neutral API, Android WebView host, Compose binding, generic tools, Koog, JSON-RPC, and TypeScript runtime modules.
• Rebuilt browser lifecycle, typed commands/results/errors, semantic observation, document/frame/element identity, and action verification.
• Added a versioned correlated protocol with cancellation, timeouts, size/pending limits, callback rate limits, and shared fixtures.
• Hardened navigation and WebView behavior: HTTPS-only default, host/scheme policy, credential rejection, Safe Browsing/TLS handling, delegated privileged requests, bounded popup relay, renderer handling, sensitive-data and diagnostic redaction.
• Added same-origin frame and open Shadow DOM support, traversal budgets, stable identity, postcondition receipts, screenshots, and untrusted-webpage markers.
• Added framework-neutral JSON Schema tools, Koog and JSON-RPC adapters, sample app, canonical docs, ADR, architecture/artifact validators, CI, release checks, APK/checksum packaging, and Maven publication workflow.
• Deleted the prototype modules, obsolete app path, legacy web injector, duplicated website docs, and compatibility surface.

Verification

Passed locally:

• TypeScript strict typecheck
• 43 runtime tests across 6 suites
• Production runtime bundle: 37,398 bytes
• Architecture and documentation-link validation
• Workflow YAML, package JSON, Android XML, and diff checks

Deferred to the planned acceptance pass:

• Gradle/JVM tests, Android lint/assembly, and emulator instrumentation
• Website install/lint/build
• Maven publication and clean consumer smoke test
• Reference-device performance baselines

Breaking change

This targets the 0.3.0-SNAPSHOT development line. Consumers must migrate to the new AgenticBrowserHost / AgenticBrowserSession API and modular coordinates; no compatibility façade is provided.

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