chore: bootstrap repo skeleton with sprint 0 plan

- .gitignore (Python, Node, RT/maldev hygiene, secrets)
- README.md (project framing, stack, conventions, status)
- CHANGELOG.md (team kickoff decisions Q1/Q2/Q3, T2/T3/T4, auth strategy)
- tasks/spec-decisions.md (D-001..D-007 arbitrations on top of frozen spec)
- tasks/todo.md (sprint 0 backlog: B0.* / F0.* / S0.* / R0.*)
- tasks/lessons.md (empty, populated as work progresses)
- backend/ frontend/ docs/ scaffolding

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tasks/lessons.md

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+# Lessons
+
+Patterns to remember across sprints. Updated after every correction or non-obvious decision.
+
+---
+
+(empty — populated as work progresses)

tasks/spec-decisions.md

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+# Spec decisions log
+
+This file tracks implementation arbitrations *on top* of the frozen spec
+(`Projects/Mimic — Spec.md` in the RT-SecondBrain vault).
+
+Format: one entry per decision, newest first.
+
+---
+
+## 2026-05-21 — Team kickoff decisions
+
+### D-001 — SOC collaboration hypothesis
+**Context.** Devils-advocate flagged the sociological assumption that SOC analysts
+will cote in the live cockpit.
+**Decision.** Hypothesis accepted as-is. No paper PoC. Risk owned by lead RT.
+
+### D-002 — Mimic deployment location
+**Context.** Spec §6 NF-network did not pin where Mimic is physically deployed.
+**Decision.** Mimic runs on RT infrastructure. SOC client connects through the
+existing RT reverse proxy (Caddy, out of Mimic scope). Mimic → Mythic / Home C2
+through outbound VPN. RT R&D (TTP library, stealthy variants) never sits on
+client premises.
+
+### D-003 — Authentication strategy
+**Context.** Spec mentions OIDC Keycloak but lab onboarding cost is high.
+**Decision.** v1 ships **local auth** (username/password, bcrypt, Flask server-side
+sessions). v2 adds Keycloak OIDC. The RBAC model is **group-based from day one**,
+so OIDC will map claims to existing groups without touching application code.
+SOC sessions remain a distinct mechanism (`soc_session.token_opaque` bcrypt hash,
+clear token out-of-band).
+
+### D-004 — C2 credential storage (T2)
+**Context.** Engagement.config_json (encrypted JSON column) vs dedicated table.
+**Decision.** Dedicated table `c2_credential (id, engagement_id, c2_type,
+config_json_fernet, version, created_at, retired_at)`. Active row per engagement =
+`retired_at IS NULL`, highest version. Rotation = insert + retire previous.
+Fernet key in env, never in DB.
+
+### D-005 — Cleanup template variable sources (T3)
+**Context.** Jinja `{{outputs.X}}` source ambiguity.
+**Decision.** Two accessors:
+- `{{outputs.text}}` → `run_step.output_text` (stdout/UTF-8 text).
+- `{{outputs.blob("<key>")}}` → reads from `output_blob_ref`, hard cap **10 MB**
+  (consistent with F8 evidence limit), UTF-8 decoding with latin-1 fallback,
+  silent refusal + log entry if the blob is non-decodable.
+`regex_extract` always operates on the resulting string.
+
+### D-006 — SOC session token storage (T4)
+**Context.** `soc_session.token_opaque` storage form.
+**Decision.** bcrypt hash. Clear token generated server-side at session creation,
+returned **once** in the API response, delivered out-of-band to the SOC analyst.
+Never re-displayable.
+
+### D-007 — Reverse proxy scope
+**Context.** Mimic exposure to internet for SOC client access.
+**Decision.** Reverse proxy (Caddy + TLS + IP allowlist) handled by existing RT
+infrastructure. Mimic ships an HTTP listener on localhost only; the deployment
+playbook wires it behind the existing proxy.

tasks/todo.md

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+# Sprint 0 — Mimic
+
+Repo skeleton + foundational modules. Nothing that depends on PR1/PR2/PR3.
+
+## Backend (`backend`)
+
+- [ ] B0.1 — `backend/` Python project: `pyproject.toml` (ruff, mypy strict, pytest, coverage),
+      `Makefile`, `Dockerfile`, `docker-compose.yml` for Postgres dev DB.
+- [ ] B0.2 — Alembic init + complete initial migration covering the §8 schema (incl. `ttp_version`,
+      `c2_credential`, `user`, `group`, `user_group`, `permission`, `group_permission`,
+      `soc_session`, audit_log with write-only Postgres role).
+- [ ] B0.3 — SQLAlchemy 2 typed mapped classes for every table + repositories scaffold.
+- [ ] B0.4 — `C2Connector` ABC + dataclasses (`Payload`, `TaskHandle`, `TaskResult`) + enum
+      `payload_type` + factory keyed on `c2_type`. **No real implementation.**
+- [ ] B0.5 — Jinja2 SandboxedEnvironment + `regex_extract` filter via `google-re2` +
+      `{{outputs.text}}` and `{{outputs.blob(key)}}` accessors with 10 MB cap.
+- [ ] B0.6 — Local auth (login/password bcrypt + Flask server-side sessions) + RBAC
+      group-based decorators + F11 permission matrix declared in code.
+- [ ] B0.7 — Flat CRUD endpoints (engagements, hosts, TTPs, scenarios) — no orchestration,
+      no WebSocket, no reporting yet.
+- [ ] B0.8 — pytest baseline: unit (SQLite) + integration scaffold (testcontainers Postgres).
+
+## Frontend (`ux-frontend`)
+
+- [ ] F0.1 — `frontend/` Vite + React + TypeScript strict + Tailwind 4 + TanStack Query 5,
+      eslint strict + prettier, Playwright skeleton.
+- [ ] F0.2 — Design system provisional: semantic tokens in `theme.css` (status colors, RT accent,
+      data mono / UI sans), dark-first palette, placeholder logo.
+- [ ] F0.3 — Wireframes (via `frontend-design` skill) on mock data:
+      Login + engagement selection, Live cockpit, Scenario composer,
+      Report + MITRE matrix, TTP library + import.
+- [ ] F0.4 — Routing skeleton + role-aware layout shell (no real auth wired yet).
+
+## Spec / Docs (`spec-analyst`)
+
+- [ ] S0.1 — Cross-check the data model in B0.2 against §8 of the spec; report deltas before merge.
+- [ ] S0.2 — Cross-check the RBAC matrix in B0.6 against F11; report deltas before merge.
+- [ ] S0.3 — Maintain `tasks/spec-decisions.md` as new arbitrations land.
+- [ ] S0.4 — Open `docs/architecture.md` once backend layout is committed.
+
+## Review (`code-reviewer`)
+
+- [ ] R0.1 — Review each PR per the published charter; block on security/OPSEC violations.
+- [ ] R0.2 — Verify mypy strict and ruff clean before approving any backend PR.
+- [ ] R0.3 — Verify TS strict, no `useEffect(fetch)`, exhaustive deps before approving any frontend PR.
+
+## Conventions
+
+- Branches: `feature/<scope>`, `fix/<scope>`, `docs/<scope>`, `chore/<scope>`. Long-lived: `main`.
+- Commits: Conventional Commits (`feat:`, `fix:`, `chore:`, `docs:`, `test:`, `refactor:`).
+- PRs: each branch → review (`code-reviewer`) → team-lead merges.
+- No direct push to `main`.