docs: sprint 6 amendment — 7-column schema in CHANGELOG + PR body

Post-review user decision (2026-06-08) switched the export payload to a
fixed 7-column FR handoff schema (Scénario / Test / Source de log /
Commentaires SOC / Exécution / Logs remontés au SIEM / Cyber incident).

Logged in CHANGELOG [Unreleased] Changed section with commit refs
(SPEC fdab324, backend 7335b9f, e2e aeb4bdb) and updated PR #9 body
counters: 255 pytest (was 253), 136 vitest unchanged, 223 e2e
unchanged.

CHANGELOG.md

@@ -36,6 +36,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 ### Changed
 - 2026-06-07 — SPEC.md § Export d'engagement added (between § Templates de simulations and § Stacks techniques). Committed as the **first** sprint commit (`7aaa5cc`), applying the fix-candidate from sprint 5's recurrent "SPEC.md uncommitted at sprint close" lesson. Four-sprint recurrence finally broken.
 - 2026-06-08 — Team `mimic` (persistent `.claude/teams/mimic/config.json`) instantiated with the full 7-agent project roster (backend-builder, frontend-builder, spec-reviewer, code-reviewer, design-reviewer, test-verifier, devil-advocate). Agents are spawned with an idle prompt at sprint start and woken via SendMessage per phase — flip vs the old "spawn-with-task-only" policy that hit the "team roster is flat" gotcha when respawning. Persistent across sprints from sprint 7+.
+- 2026-06-08 (post-review, pre-merge) — **Export schema switched to a fixed 7-column handoff layout** uniform across MD/CSV/PDF. Columns (FR headers): `Scénario`, `Test`, `Source de log`, `Commentaires SOC`, `Exécution` (multi-line concat without labels — `executed_at` → `commands` → `execution_result`), `Logs remontés au SIEM`, `Cyber incident`. Removed from the export (intentional, handoff-focused): simulation status, MITRE techniques/tactics, prerequisites, id, created_at, updated_at. Markdown switched from narrative-per-simulation to a GFM table. PDF switched from sectioned HTML to a single `<table>`. SPEC `fdab324`, backend refactor `7335b9f`, e2e adaptation `aeb4bdb`. Final counters: backend 255 pytest, frontend 136 vitest, e2e 223 Playwright.
 
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