Refresh context for the Root Sequence router role

[raelovejoy]

Why this is needed

Merged PR #24 changes Root Sequence’s current working model from a broad project “about connections” to a transdisciplinary router + synthesis + build role. It also replaces site/index.html with a new router-role review candidate while deliberately leaving the September 18 approval record unchanged.

Proposed edits

• update START-HERE.md so the concise orientation names the router role and distinguishes the current website candidate from the last approved edition;
• update PROJECT-CONTEXT.md to route readers to the canonical Research Method / Method & Concept Router and record the blocked publication state;
• correct three stale file descriptions in site/README.md that still called the current candidate and digest “approved.”

The edits preserve PR #24’s boundaries: the method does not replace native disciplines, different mechanisms are not treated as identical, the revised site is not approved or released, and its full validation remains outstanding.

The top-level README.md link to START-HERE.md is present and working, so it is unchanged.