[E4-1] Consensus always returns status running — implement output parsing

[OneStepAt4time]

Finding: CON-1 (HIGH) | Milestone: M-E4: Reliability (#18)

Problem: Consensus always returns status running. Reviewer session output is never read.

Fix: Wire transcriptReader.readNewEntries for each reviewer session. Parse findings. On reviewer completion set status complete. Update GET /v1/consensus/:id.

Files: src/consensus.ts, src/server.ts

Acceptance: GET /v1/consensus/:id returns status complete with non-empty findings.

[OneStepAt4time]

Duplicate of Scribe's enterprise review issues (#1392-#1456). Closing canonical set.