apply

1. Prereqs: `lens` on PATH, `lens.yml` exists (if not, tell user and stop). 2. Run `lens apply --dry-run` via Bash. Capture stdout — this is the context bundle. 3. Invoke the `EnterPlanMode` tool with a plan prompt consisting of: --- You are about to make code changes that bring the codebase in line with the lens artifacts below. Focus on the deltas since the last apply; ignore unchanged lenses unless their current implementation is broken. <paste the captured bundle here, verbatim> --- 4. After the user exits plan mode (plan accepted + changes applied): - Run `git status --porcelain` via Bash. - If empty AND HEAD has advanced past refs/lens/applied, run `lens mark applied`. - Else, tell the user: "Commit your changes, then run `/lens:mark applied` to advance the ref."