archive superseded SSP v1 with decision notes

Move docs/product/ssp.md to docs/archive/ssp-v1.md. The original
thin intent doc is superseded by ssp-refined.md which adds the full
conversational activation spec, two-phase relationship model, and
integration with UC-04/UC-05 use cases.

Update product README to reference ssp-refined.md as the operating spec.
Archive README updated to catalog the archived file.

Decision: original preserved for historical traceability; do not use
as implementation reference.

Co-authored-by: Ty <tybala@outlook.com>
Signed-off-by: Ty <tybala@outlook.com>

docs/product/README.md

@@ -7,7 +7,7 @@ Product definitions for what we build and sell. Align with [Canonical Strategy](
 1. [overview.md](./overview.md) — platform map and surfaces  
 2. [use-cases/](./use-cases/) — canonical specs (start with UC-01 and UC-02)  
 3. [genre-packs.md](./genre-packs.md) — vertical primitives  
-4. [ssp.md](./ssp.md) — Self-Service Portal as **activation**, not the whole product  
+4. [ssp-refined.md](./ssp-refined.md) — Self-Service Portal, refined spec (conversational, two-phase)  
 5. [intermediate.md](./intermediate.md) — tourism/chamber intermediate surface  
 
 ## Center of gravity