aif-plan

# Plan - Implementation Planning Create an implementation plan for a feature or task. Two modes: - **Fast** – quick plan, no git branch, saves to the configured fast plan path (default: `.ai-factory/PLAN.md`) - **Full** — richer plan, asks preferences, saves to the configured full-plan directory, and optionally creates a git branch/worktree when git is enabled and branch creation is allowed ## Workflow ### Step 0 (pre): Detect Handoff Mode Determine Handoff mode, task ID, and branch contract. Resolve each value independently so legacy callers that pass only `HANDOFF_MODE` and `HANDOFF_TASK_ID` still enter Handoff mode correctly: - `HANDOFF_MODE`: explicit prompt value if present; otherwise environment value; otherwise empty string. - `HANDOFF_TASK_ID`: explicit prompt value if present; otherwise environment value; otherwise empty string. - `HANDOFF_BRANCH_PREPARED`: explicit prompt value if present; otherwise environment value; otherwise `0`. - `HANDOFF_BRANCH_NAME`: explicit prompt value if present; otherwise environment value; otherwise empty string. Use the Bash tool only for values that were not passed explicitly in the prompt: ``` Bash: printenv HANDOFF_MODE || true Bash: printenv HANDOFF_TASK_ID || true Bash: printenv HANDOFF_BRANCH_PREPARED || true Bash: printenv HANDOFF_BRANCH_NAME || true ``` **Then check `HANDOFF_MODE`:** #### When `HANDOFF_MODE` is `1` (autonomous Handoff agent) The Handoff coordinator already manages status transitions and DB writes dir...