Prepare for public release

- README, LICENSE (MIT for the port layer), NOTICE, CONTRIBUTING.
- Restructure docs: internals.md, porting-notes.md, dev-process.md +
  dev/agentic-development.md (the research write-up), dev/ (raw record).
- Replace decomp status-badge CI with a PC-port validate workflow.
- Remove session/agent scaffolding and stale planning docs from the tree.
- Add .gitattributes (normalize line endings to LF); add screenshots.

The pre-2026-08 history is the GoldenEye 007 decompilation by Larry Ficken
(KholdFuzion) and contributors, preserved unchanged. The PC-port work from
2026-08-17 on is mine.

port/shim/stdlib.h

@@ -9,7 +9,7 @@
  * `#include <stdlib.h>`, which resolves to the N64 header via -I), and the
  * lldiv_t/ldiv_t typedefs then conflict with the host's. The shim routes C++
  * TUs to the host header by absolute path (generated hoststdlib.h, same
- * trick as port/shim/string.h — see docs/PCPortResearch.md §11 D12).
+ * trick as port/shim/string.h — see docs/internals.md §11 D12).
  *
  * Inert in the N64 build (port/shim is not on its include path).
  */