test(mcp): refresh context baselines after combined schema growth - #6580

Ladon verdict: Approve

Approve — test-only baseline refresh, no blocking findings.

This PR touches only three test files (server/tests/unit/product-discovery-schema-parity.test.ts, tests/mcp-schema-analysis.test.cjs, tests/mcp-schema-projection.test.cjs), bumping hardcoded MCP schema-context counts and two size ceilings (128→132 KiB compact product-discovery, 384→388 KiB media-buy model-context) to absorb schema growth already merged to main. Counts move consistently (+3 across unique_definitions, dictionary $defs, and both shared_dictionary counts from the same new defs), the standalone context_bytes assertion stays pinned to an exact value, and no published protocol surface (static/schemas/source/, normative docs, dist/) is touched — so no changeset is required.

Decision path: no critical/high findings (row 1 n/a); gated_paths=false so row 2 does not fire despite review_decision=REVIEW_REQUIRED; high_risk=false (rows 3/5 n/a); no medium findings in any escalatable category (row 4 n/a); no prior decision (row 6 n/a); no no-auto-approve team match (row 7 n/a); zero medium findings (row 8 n/a). Falls through to row 9 → approve.