update-planlisted

# Update Plan from User Responses Process user responses in `questions.md` and update all related planning documents accordingly. ## Prerequisites - A plan must already exist under `{repo root}/.ai/planning/` created by the `planning` or `planning-mode` skills - For default (non-`ask`) mode: the plan's `questions.md` must contain at least one question with a non-empty `### Response` section - For `ask` mode: the plan's `questions.md` must contain at least one unprocessed question (with or without a response) ## Argument parsing The skill takes a single optional argument: - If the argument is the literal string `ask` (case-insensitive, trimmed) → enable **ask mode** and locate the plan via the Phase 1 strategies below (folder is not specified separately). - If the argument is anything else → treat it as a folder name (existing behaviour). - If the argument is empty → no mode flag and no folder; fall through to the Phase 1 strategies. `ask` is standalone — it cannot be combined with a folder name on the same invocation. If the user needs ask mode against a specific plan in a multi-plan repo, the Phase 1 multi-plan prompt will let them choose. Throughout the rest of this skill, **ask mode** refers specifically to the case where the argument was `ask`. ## Phase 1: Locate the plan Resolve the target plan using the first matching strategy: 1. **Context inference** — check your conversation context for a plan folder path from a prior `planning-mode`/`planning` skill invoc