nx_meal_effort.nx

nx_meal_effort.nx -- LIB: OPPORTUNITY COST. "Is cooking this actually the right use of my evening?" The planner already knows what a dish COSTS in ingredients. That is only half a decision. The other half is TIME -- and time is not a property of the recipe, it is a property of the PERSON COOKING IT. A cook who has never dressed an onion takes two and a half times as long as one who has, so the same dish is a cheap weeknight for one household and a bad trade for another. This engine makes that explicit, and it is the seam where the skill coach changes the answer: get better at the knife and cooking-at-home genuinely wins more often. Skill is not decoration here, it is a term in the arithmetic. Options compared: SCRATCH (raw ingredients + your time), PREPPED (pre-cut fresh, less time, more money), FROZEN (least time, least money, a quality call the engine does NOT pretend to make), RESTAURANT (no time, most money). Alternatives are DATA rows, so adding "meal kit" is a row, not a recompile (rule 11). THREE HONESTY INVARIANTS, each gate-enforced, because each one silently flatters cooking at home: 1. AN UNASSESSED SKILL IS NOT AN EXPERT SKILL. If we have never measured someone chopping, ef_step_time returns -1 and the step is counted as UNKNOWN. Defaulting an unmeasured cook to "fast" is how a planner tells a beginner a two-hour braise is a thirty-minute dish. 2. NO INVENTED WAGE. If a household has not said what an hour of theirs is worth, the comparison reports MONEY ONLY and says so. Picking a plausible-looking hourly rate would make the ranking an opinion wearing arithmetic's clothes. 3. ONLY FULLY-KNOWN OPTIONS MAY BE RANKED. An option missing either its money or its time is reported, never ranked -- the same coverage rule that stops a shop carrying one ingredient winning the basket. Integer cents and whole seconds throughout; no floats anywhere. Schema (prefix passed in, e.g. knowledge/store/meal-): meal:skill:<sid> -> name <t> parent-sid <t> what it is (the broad -> specific skill tree) meal:skills -> TAB list of skill ids meal:steps:<rid> -> step count meal:step:<rid>:<n> -> label <t> skill-sid <t> base_seconds (base = a competent cook's pace) meal:level:<unit>:<sid> -> assessed level 0..4 (absent = NEVER ASSESSED, not zero) meal:tmul:<level> -> time multiplier in permille (data-driven, never hardcoded) meal:timevalue:<unit> -> cents per hour (absent = not valued, not free) meal:alt:<rid>:<kind> -> price_cents <t> minutes <t> source <t> date license_tier: ORIGINAL No hw writes (Rule 26).