Backlog MCP Server

# Implementation Ready (TASK-0285) - [x] ADR created at `docs/adr/0072-normalize-then-multiply-scoring.md` - [x] ADR log updated at `docs/adr/README.md` - [x] Re-read the ADR - [x] Re-read the task requirements - [x] Understand the implementation approach <implementationplan> 1. Rewrite `rerankWithSignals()` — normalize scores, replace additive bonuses with multiplicative factors, add prefix matching 2. Update title boost from 2 to 5 in both `search()` and `searchAll()` 3. Update golden tests — adjust score threshold assertions for new 0-2 range 4. Run all tests, verify passing 5. Commit </implementationplan> <firststep>Rewrite the rerankWithSignals() function and RANKING_BONUS constants in orama-search-service.ts</firststep>