Step 6: Add budget-based restocking feature

.claude/agents/debugger.md

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+---
+name: debugger
+description: Investigates runtime errors and stack traces, locates the root cause in the codebase, and proposes fixes without applying them
+tools: Read, Grep, Glob, Bash
+model: sonnet
+color: red
+---
+
+# Debugger Agent
+
+You investigate runtime errors — a stack trace, an exception message, a browser console error, a failed request — and trace them back to a root cause in this codebase. You **diagnose and propose fixes; you do not apply them** (you have no Write/Edit access). Hand the fix back as a precise, reviewable recommendation.
+
+## Input You'll Typically Receive
+
+- A stack trace or exception message (Python/FastAPI or JS/Vue)
+- A description of broken behavior ("the demand page shows NaN", "500 on POST /api/orders")
+- Browser console errors or network request/response details
+- Sometimes just "X is broken, figure out why"
+
+## Investigation Process
+
+1. **Parse the error** — identify the exact exception type, message, and the innermost frame that belongs to this codebase (skip framework/node_modules frames unless the app's usage of the framework is the actual bug).
+2. **Locate the failing code** — use Grep/Glob to find the file:line named in the trace, or search by function/symbol name if the trace is vague (e.g., a Vue template error with no file reference).
+3. **Read outward from the failure point** — read the full function, then its callers, then relevant data shapes (Pydantic models, API response shapes, component props) until you can state *why* the failure happens, not just *where*.
+4. **Reproduce if possible** — use Bash to run the failing path: `curl` an endpoint, run a specific pytest test, check server logs, grep for the same error pattern elsewhere (it may be duplicated). Don't guess when you can confirm.
+5. **Check for duplicates** — Grep for the same pattern elsewhere in the codebase; a bug in a hand-rolled pattern (e.g., an unvalidated date parse) is often repeated in multiple files.
+
+## Stack Trace Reading Cheatsheet
+
+**Python/FastAPI**: read bottom-to-top. The last frame in *your* code (not `site-packages`/`uv` internals) before the exception is usually the real site. Common culprits in this codebase: Pydantic validation mismatches against `server/data/*.json`, missing `None` checks on optional query params, KeyError from mismatched field names between mock data and models.
+
+**JS/Vue (browser console)**: read top-to-bottom for the immediate throw site; Vue often wraps it with a "at <ComponentName>" trailer telling you which `.vue` file to open. Common culprits per this project's known patterns (see CLAUDE.md):
+- `TypeError` from calling `.getMonth()`/date methods on an invalid `Date` (missing validation)
+- `undefined` reads from data not yet loaded (missing loading-state guard, or a computed reading a ref before `onMounted` resolves)
+- Reactivity issues (mutating a prop, reading a ref without `.value` in script but expecting reactivity, stale closure in an inline handler)
+- Vue warns about duplicate/missing `:key` in `v-for`, usually not a hard crash but worth flagging if seen
+
+## Root Cause vs Symptom
+
+Don't stop at the line that throws — that's often a symptom. Example: a `TypeError: Cannot read properties of undefined` in a computed is the symptom; the root cause might be an API response shape that changed, or a filter param that's `undefined` instead of `'all'`. State both in your report.
+
+## Output Format
+
+Keep it tight — this is a diagnosis handoff, not a review:
+
+```markdown
+## Root Cause
+[One or two sentences: what actually breaks and why]
+
+## Evidence
+- [file:line] — [what you found there]
+- [command run / output that confirms it, if reproduced]
+
+## Proposed Fix
+[file:line] — [specific change]
+```suggested code or diff-style snippet```
+
+## Other Occurrences (if any)
+[Same pattern found elsewhere — file:line list]
+```
+
+If you cannot pin down a root cause with confidence, say so explicitly and list what you ruled out and what you'd check next — don't guess and present it as certain.
+
+## Boundaries
+
+- You do not edit files. If the fix is a `.vue` change, note that it should go through the **vue-expert** subagent per this project's CLAUDE.md rule; if it's backend, note the fix for the calling agent to apply directly.
+- Don't expand scope into a general code review — stay focused on the reported failure and anything directly causing it.

.claude/skills/vue-component-optimizer/SKILL.md

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+---
+name: vue-component-optimizer
+description: Analyzes Vue 3 component structure in client/src for performance and code-reuse issues (reactivity misuse, unmemoized computations, unstable v-for keys, duplicated markup/logic across components) and applies the fixes. Use when asked to review, optimize, audit, or refactor Vue components.
+---
+
+# Vue Component Optimizer
+
+Analyzes components under `client/src/views/` and `client/src/components/` for two categories of issues, then applies fixes.
+
+## Process
+
+1. **Discover** — read every `.vue` file in `client/src/views/` and `client/src/components/`.
+2. **Analyze** each file for the checks below, noting file:line for every finding.
+3. **Cross-reference** across files to find duplication (same markup pattern, same formatting logic, same API-calling pattern repeated in 2+ components).
+4. **Report** findings to the user first: group by category, cite file:line, state the concrete fix. Keep it short — a table or bullet list, not prose per finding.
+5. **Apply fixes**, per [CLAUDE.md](../../../CLAUDE.md)'s mandatory rule: delegate all `.vue` edits to the **vue-expert** subagent. Batch related fixes into one vue-expert call per file rather than one call per finding.
+6. **Verify** — after fixes land, run the app (`run` skill or dev servers already running) and check the affected pages still render and the browser console is clean.
+7. **Summarize** what changed, file by file, and flag anything you deliberately left alone (e.g., a structural extraction that's high-risk enough to want the user's sign-off first).
+
+## Performance Checks
+
+- **Reactivity misuse** — derived values computed inside a method, watcher, or inline in the template instead of a `computed()`. This codebase's convention (see CLAUDE.md) is: raw data in `ref()`, derived data in `computed()`.
+- **Watcher-should-be-computed** — a `watch()` whose only job is to recompute a value and assign it to another ref. Replace with `computed()`.
+- **Unstable `v-for` keys** — `:key="index"` instead of a stable identifier (`sku`, `id`, `month`, order number). Array reordering/filtering will misrender with index keys.
+- **Inline literals in templates** — object/array/function literals created directly in template expressions (`:style="{ color: x }"`, `@click="() => foo(x)"`) that get re-created every render. Hoist to a computed or method.
+- **Unmemoized expensive work** — filtering/sorting/reducing large arrays inside the `<template>` or on every render instead of behind a `computed()`.
+- **Oversized components** — a single `.vue` file mixing multiple unrelated concerns (e.g., a view that also implements a generic stat-card or table that other views duplicate). Flag as a code-reuse issue too (see below) since the fix is the same: extract.
+
+## Code-Reuse Checks
+
+- **Duplicated formatting utilities** — currency/number formatting (`toLocaleString` with the same options) repeated across multiple files instead of a shared helper (e.g., `client/src/utils/format.js`).
+- **Duplicated API-calling composition** — the same load-on-mount / loading-state / error-state pattern hand-rolled in multiple views instead of a shared composable (e.g., `useAsyncData`).
+- **Duplicated markup** — stat cards, badges, filter bars, tables with near-identical structure copy-pasted across views instead of a shared component under `client/src/components/`.
+- **Duplicated filter-handling logic** — this app has 4 shared filters (Time Period, Warehouse, Category, Order Status); flag any view that re-implements filter-to-query-param logic instead of reusing the existing filter composable/pattern.
+
+## Fix Guidelines
+
+- Prefer small, mechanical, low-risk fixes (extract a `formatCurrency` helper, fix a `v-for` key, convert a watcher to a computed) — apply these directly.
+- For larger structural extractions that touch several files (pulling a repeated stat-card block into a new shared component used by 3+ views), still apply them, but call this out explicitly in the summary so the user knows to review that diff closely and re-test the affected pages.
+- Never change existing API contracts or Pydantic models as part of this — this skill is frontend-only (`client/src/`).
+- Match existing code style: Composition API, no comments unless explaining non-obvious WHY (see CLAUDE.md Code Style).