Update README and docs content

Add new docs pages and LLM context files, and remove the legacy SHANNON-PRO.md file.

docs/coverage-roadmap.md

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+# Coverage and Roadmap
+
+Shannon Lite focuses on exploitable findings that can be validated against a running application.
+
+## Current Shannon Lite Coverage
+
+- Broken Authentication
+- Broken Authorization
+- Injection
+- Cross-Site Scripting
+- Server-Side Request Forgery
+
+## Reporting Philosophy
+
+Shannon Lite follows a proof-by-exploitation model. Findings that cannot be demonstrated with a working proof of concept are not included in the final report.
+
+This reduces speculative noise, but it also means Shannon Lite does not aim to report every possible security issue in a repository. In particular, many dependency, policy, configuration, and broad static-analysis findings are outside the core Shannon Lite workflow.
+
+## Roadmap Direction
+
+Planned coverage areas should continue to live in the repository's canonical roadmap document if one exists. The README should link to that document rather than carrying detailed roadmap history inline.
+
+For organizations that need broader static and organizational coverage now, see [Shannon Pro](shannon-pro.md).