Addresses reviewer REQUEST_CHANGES (run 768) on ORCH-124 — docs-only,
no src/tests touched, fix scope unchanged.
P1: update docs/overview/ showcase for the new serial-gate "pause without
blocking" axis (changed task-routing functionality, ORCH-011/ORCH-079):
- tech-pipeline.md: FIFO exception "pause without blocking" next to freeze
- tech-data-model.md: durable signal tasks.paused_at on the Task row
- tech-observability.md: paused/reason in serial_gate GET /queue block +
operator endpoints POST /serial-gate/pause|resume
P2: strip leaked tool-call trailing tags (</content>/</invoke>) from 4
golden-source docs of this PR (06-adr/ADR-001, adr-0051,
08-data-requirements.md, 10-tech-risks.md).
CHANGELOG "Доки" bullet extended accordingly. Full suite green (2178 passed);
test_system_docs.py green (machine-checked showcase facts intact).
Refs: ORCH-124
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
