docs: doc-claim drift detected on 2026-06-22

[NickCrew]

Automated doc-drift scan across 12 doc files found 37 findings in 10 files (2 clean).

Severity summary

Severity	Count	Meaning
P0	11	User-facing factual errors (wrong defaults, broken commands, nonexistent routes)
P1	24	Dev-doc errors (wrong paths, missing files, stale APIs)
P2	2	Minor staleness

P0 highlights (breaking / user-visible)

• DEMO_MODE default documented as strict or true in 4 files — actual default is full (app/config.py:31)
• make -C apps/vuln-api test-* in README and developer-guide — no Makefile exists, only justfile
• Docker port mapping -p 8880:8880 in dockerhub-overview — container listens on 80, so mapping must be -p 8880:80
• GET /api/v1/accounts/balance, POST /api/v1/transfers/wire in api-reference — neither route exists
• ENABLE_VULNERABILITIES=true in API-DOCUMENTATION — env var doesn't exist in app/config.py
• Broken link docs/API-DOCUMENTATION.md in apps/vuln-api/README.md — file is at repo root, not in docs/

Backlog task

All 37 findings with per-finding fix proposals and acceptance criteria are in:
backlog/tasks/task-17 - Doc-drift-detected-2026-06-22.md

This PR adds only the backlog task file. It does not modify any of the 12 audited doc files — fixes belong in a follow-up task.

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