Update manuscript

manuscript/main/README.md

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+# Main ICASSP manuscript
+
+This is the editable paper directory. It uses the unmodified official ICASSP
+2026 LaTeX assets stored in `../ICASSP2026_Paper_Templates/`. When the ICASSP
+2027 author kit is released, replace or add the official template and update
+`TEMPLATE_DIR` in the Makefile only after checking the new instructions.
+
+Compile from this directory:
+
+```bash
+make
+```
+
+The PDF and all intermediate files are written to `build/`; only source files
+belong in Git.
+
+Current source layout:
+
+```text
+main/
+  main.tex
+  references.bib
+  Makefile
+  README.md
+  build/            # generated, ignored
+```
+
+The author/affiliation, final results, Method, Experimental Setup, Results and
+Conclusion are still explicit TODOs. Do not turn planned experiments into
+reported findings.