Clean up documentation and rewrite README

Removed unnecessary markdown files that were either outdated or
redundant (BUILD.md, PROJECT_SUMMARY.md, TODO.md, RESEARCH_FRAMEWORK.md).
Most of this info is either completed or captured elsewhere.

Rewrote README in a more natural, conversational style. Less formal,
more straightforward about what the tool does and how to use it.
Kept the technical details but made it more accessible.

.claude/settings.local.json

@@ -10,7 +10,9 @@
       "Bash(cargo clippy:*)",
       "Bash(cargo build:*)",
       "Bash(source ~/.zshrc)",
-      "Bash(source ~/.cargo/env)"
+      "Bash(source ~/.cargo/env)",
+      "Bash(Select-String \"warning\")",
+      "Bash(Select-Object -First 30)"
     ],
     "deny": [],
     "ask": []