G2 S5: rewrite dv2-multi-branch demo narration off the fashion-retailer legend (B2)

[brownjuly2003-code]

Summary

• G2 audit finding B2: docs/dv2-multi-branch/demo_voiced.narration.txt and demo_transcript.txt still told the story of a "mid-market fashion retailer" (50 people, 18% returns, 40/25/15/10/10 branch split) — left over from before the kitchen-appliance-wholesaler legend migration, directly contradicting the project's own "never a retailer" guardrail.
• Rewrote both scripts to the current legend, grounded in domain.md §4's three operational pains (cross-channel oversell on a shared warehouse, 40-60 day China container ETA, five-program ops triage: 1C/Bitrix24/WMS/marketplace cabinets/Excel) and repinned the technical numbers each beat quotes (table counts, branch order distribution, query latency, BV MDM counts) to the real re-captured figures already documented in demo_evidence.md (2026-07-03 recapture). Applied the "loyalty → dealer bonuses" vocabulary guardrail from domain.md §5.4.
• demo_transcript.txt Beats 1/5a/5b (cluster topology, cold-offload) are untouched — those are kind-cluster sections already flagged in demo_evidence.md as pending Mac re-capture (plan step S6), out of scope for this text-only fix.
• Added a "superseded" notice in demo.cast.README.md, demo.html, and demo_evidence.md: the text scripts are rewritten in this PR, but demo_voiced.mp4 and demo.cast (captured 2026-05-23) still carry the old fashion-retailer narration/numbers and are pending TTS+ffmpeg re-recording on the Mac stand (S6). Media files are unchanged, not deleted or regenerated.
• Verified no other doc references the old fashion-retailer framing or the 40/25/15/10/10 split as current (git grep -i fashion, git grep -i "40/25/15/10/10"); the remaining hits are the new superseded-marker text itself, plus pre-existing "retired seed" references in demo_evidence.md/generator-spec.md that already correctly frame the old numbers as retired.

Test plan

• ruff check src/ tests/ scripts/ — clean
• ruff format --check src/ tests/ scripts/ — clean (361 files already formatted)
• mypy src/ --ignore-missing-imports — clean (docs-only change, unaffected)
• Searched tests/ for references to demo_voiced/demo_transcript/demo.cast/demo_evidence — none found, no test updates needed
• git grep -i fashion / git grep -i "40/25/15/10/10" — only the intended superseded-marker text and pre-existing "retired" references remain

🤖 Generated with Claude Code

[github-actions]

DORA Metrics

• Window: last 30 days
• Branch: main
• Deployment frequency: 87 total / 20.3 per week
• Lead time for changes: avg 0.57h / median 0.0h
• Change failure rate: 58.62% (51/87)
• MTTR: n/a across 0 incident(s)

MTTR note: No failed mainline CI runs in the selected window.