feat: add Home Depot provider

[fnziman]

Adds a new homedepot subcommand that syncs Home Depot purchases into Monarch, mirroring the walmart/costco/amazon providers.

Closes / references #31. Design follows the plan you signed off on in that thread.

Design

• Companion Go client: github.com/fnziman/homedepot-go — MIT, tagged release v0.1.1 — handles the internal /oms/customer/order/v1/user/{userId}/orderhistory + /orderdetails endpoints via cookie replay (decodes THD_CUSTOMER for the auth token). The client itself is scrubbed-fixtures-only (no real cookies/tokens/PII), 85.6% covered, go 1.25.12 to match this repo's CI pin.
• Provider package at internal/adapters/providers/homedepot/. Wraps the client's OrderDetail / LineItem types to satisfy providers.Order / providers.OrderItem. Both online and in-store orders supported. Online orders use orderNumber as the dedup ID; in-store use a composite hd-instore-{store}-{transactionId} (since orderNumber is empty for in-store).
• Wiring: internal/cli/providers.go:NewHomeDepotProvider (mirrors the costco/walmart shape, threads a scoped *slog.Logger via hdgo.Config{Logger: hdLogger} — matches the walmart/costco Config-struct pattern per your ask), new case "homedepot": in cmd/itemize/main.go, HomeDepotConfig in config.go, homedepot: block in config.yaml, env-var fallbacks (HOMEDEPOT_LOOKBACK_DAYS, HOMEDEPOT_MAX_ORDERS, HOMEDEPOT_COOKIE_FILE).
• Merchant matching: no interface change needed. fetch.go matches on DisplayName() which is "Home Depot" — that case-insensitively substring-matches Monarch's canonical "THE HOME DEPOT".
• Refunds & Ollama: intentionally out of scope for v1 (per your "keep the PR focused" note). SupportsRefunds() = false; refund handling can go in a follow-up.

Test plan

• go test ./... -race — all green, provider package at 95.1% coverage, categorizer/adapter packages unchanged
• go vet ./... — clean
• golangci-lint run ./... — clean for touched files (two pre-existing QF1012 warnings on categorizer.go:285,290 predate this PR)
• go build -o itemize ./cmd/itemize/ — ./itemize shows homedepot Sync Home Depot orders in usage and HOMEDEPOT_* env vars in help
• go.mod stays on go 1.25.12 (verified after go mod tidy)
• Manual live run on my own account: HOMEDEPOT_COOKIE_FILE=~/.homedepot-api/cookies.json ./itemize homedepot -dry-run -days 14 -verbose — happy to run this and report back once you've had a chance to look at the code

Docs

• README updated with homedepot row + example usage
• New docs/homedepot-specifics.md covers cookie export walkthrough (DevTools snippet), the online/in-store distinction, 24-month history cap, MFA re-auth flow, and a troubleshooting table

Deferred / follow-ups (not in this PR per your "keep it focused" note)

• Refund handling (OrderDetail.returnTotal is available; just not wired)
• LICENSE file on this repo
• docs/adding-providers.md refresh (still references the pre-rename module path and internal/providers/)

Happy to iterate — let me know if you'd like any part of this reshaped before merge.

[codecov]

Codecov Report

❌ Patch coverage is 94.87179% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.06%. Comparing base (8cb5ee9) to head (75a2dfb).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/adapters/providers/homedepot/provider.go	93.10%	4 Missing ⚠️
internal/adapters/providers/homedepot/order.go	96.22%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   64.34%   65.06%   +0.71%     
==========================================
  Files          49       51       +2     
  Lines        6575     6761     +186     
==========================================
+ Hits         4231     4399     +168     
- Misses       2037     2046       +9     
- Partials      307      316       +9     

Flag	Coverage Δ
unittests	65.06% <94.87%> (+0.71%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/infrastructure/config/config.go	82.05% <100.00%> (+0.97%)	⬆️
internal/adapters/providers/homedepot/order.go	96.22% <96.22%> (ø)
internal/adapters/providers/homedepot/provider.go	93.10% <93.10%> (ø)

... and 3 files with indirect coverage changes

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