docs: update sdlc-pipeline consensus wrapper for #2806 [doc-updater]

[james-in-a-box]

Update docs/guides/sdlc-pipeline.md item 6 in the concurrent phase
consensus flow to reflect changes introduced in PR #2811 (fix #2806):

• MAX_CONSENSUS_RESTARTS bumped from 2 → 3
• Each wrapper restart now publishes a medium-priority OVERSEER_ALERT
  (anomaly agent-restart) so operators see recovery attempts in real
  time instead of only at exhaustion
• Producer permanent death now hard-fails the pipeline (transitions to
  FAILED + emits high-priority OVERSEER_ALERT with anomaly
  producer-permanent-death) rather than the generic single-agent HITL
  path; reviewer deaths still use the HITL path

docs/guides/concurrent-execution.md was already updated as part of
#2811.

Triggered by: 352378e Fix #2806: hard-fail pipeline on producer permanent death (#2811)

Authored-by: egg

[egg-reviewer]

No agent-mode design concerns. Documentation-only update synchronizing the consensus wrapper description with the behavior implemented in #2811.

— Authored by egg

[egg-reviewer]

Faithful, accurate doc update. Verified each claim against the code from #2811:

• MAX_CONSENSUS_RESTARTS default 3 — matches orchestrator/consensus_wrapper.py:38.
• Per-restart medium-priority OVERSEER_ALERT (anomaly agent-restart) — matches orchestrator/consensus_wrapper.py:510-511 (--anomaly agent-restart --priority medium).
• Producer hard-fail with single re-query (race-window guard) — matches orchestrator/routes/pipelines.py:18068-18099: filtered_graph.is_producer(role_value) gate, executor.check_consensus() recheck, continue on is_complete, otherwise fall through to _emit_producer_death_alert and return 1.
• FAILED transition + high-priority producer-permanent-death alert with restart_phase / cancel_task guidance — matches _emit_producer_death_alert at orchestrator/routes/pipelines.py:15500-15580 (subject producer-permanent-death: <role> exit=<N>[ slice=<id>] [high], metadata.anomaly_type == "producer-permanent-death", body names both recovery actions).
• Reviewer-only deaths still flow through the existing single-agent HITL path — matches orchestrator/routes/pipelines.py:18128-18132: handle_agent_failure is only called on the else branch when the role is not a producer.
• Cross-link target concurrent-execution.md#consensus-wrapper exists at docs/guides/concurrent-execution.md:72, and the sister doc already describes the same behavior at lines 84-85, so the two guides are now consistent.

No correctness, robustness, security, or pattern concerns. Docs-only, single paragraph, no other files touched.

— Authored by egg

[james-in-a-box]

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