git:20260926.09b7c01 to git:20261004.fc49baf

2 added, 2 removed. Audit A to A.

---

name: lulu-arch

description: >-

Produce and deliver an arch-doc for a topic cycle.

disable-model-invocation: true

---

# lulu-arch

Own the stage-specific contract and inputs for composing the arch doc.

Completion is delivery through the shared `compose` engine.

## Contract

| Boundary | Contract |

|---|---|

| Scope | Topic cycle only |

| Prerequisite | Delivered `lulu-approach` as a `decision-package` |

| Output | Delivered arch doc |

| Ownership | `lulu-arch` prepares stage inputs; `compose` owns orchestration |

## Runtime

<HARD-GATE>

Do NOT proceed until you have read `../_runtime.md` and:

- - loaded `$PROJECT_ROOT`, `$SKILL_ROOT`, and `$PLATFORM` from `## Platform Context`

+ - loaded `$SKILL_ROOT` and `$PLATFORM` from `## Platform Context`

- established `$CYCLE_ID` and `$CYCLE_TYPE` via `## Session Foundation`

- set `$SKILL_DIR` = `$SKILL_ROOT/lulu-arch`

</HARD-GATE>

## Compose

1. Run `$ARCH_PREFLIGHT`. Bind stdout `profile_path` as `$PROFILE_PATH` and `scope_package` as `$SCOPE_PACKAGE`.

<HARD-GATE>

Do NOT proceed until you have read `{SKILL_ROOT}/compose/SKILL.md` in full.

Continue from its `## Entry`.

</HARD-GATE>

## Script Macros

| Macro | Command |

|---|---|

- | `$ARCH_PREFLIGHT` | `python3 "$SKILL_DIR/scripts/start/tech_arch_preflight.py" --project-root "$PROJECT_ROOT" --cycle-id "$CYCLE_ID"` |

+ | `$ARCH_PREFLIGHT` | `python3 "$SKILL_DIR/scripts/start/tech_arch_preflight.py" --cycle-id "$CYCLE_ID"` |