fix(plugins): accept weak catalog etags

.project-docs/30-worklog/tasks/20260901-plugin-catalog-load-client-7d4a8c21.md

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+# Task: Diagnose MakeLore Marketplace catalog loading
+
+## Identity
+
+- Task ID: 20260901-plugin-catalog-load-client-7d4a8c21
+- Mode: Feature
+- Branch: codex/20260901-plugin-catalog-load-client-7d4a8c21-plugin-catalog-load-client
+- Worktree: D:\Datas\OthersProjects\makelore-plugin-catalog-load-client-7d4a8c21
+- Base commit: 5e8b7266c2a8297c9d307b576256886659d44780
+- Owner: codex-root
+- Status: Ready for Integration
+
+## Scope
+
+- Reproduce the installed MakeLore Marketplace catalog failure at the Renderer → IPC dispatcher → Main Marketplace client boundary.
+- Verify the installed 1.2.0 artifact contains the current Marketplace composition and compare its parser/network behavior with the live catalog.
+- If a client defect is confirmed, change only the smallest Marketplace client/Host API/error-projection seam and focused tests.
+
+## Intent And Constraints
+
+- Preserve the occupied client root worktree and its untracked packaging record; all product work stays in this isolated worktree.
+- Do not expose Works credentials, read real `.env` files, alter Package Store/Provider/billing state, or publish a package.
+- Treat local-package inference as forbidden: a failed server catalog must remain fail closed.
+- The tight loop must reproduce the exact initial catalog failure or prove each boundary healthy before any implementation change.
+
+## Plan
+
+1. Verify the live catalog parses through the exact client DTO parser.
+2. Inspect the running installed Main process, local Host API, logs, embedded bundle, and effective API origin.
+3. Reproduce the failing boundary with a focused test/probe, rank falsifiable causes, and implement only the confirmed fix.
+4. Run focused regressions and task documentation gates; do not rebuild/publish unless the fix affects packaged behavior and needs an artifact proof.
+
+## Outcome
+
+- Completed. The Marketplace client now accepts both strong and standards-compliant weak composite ETags, while preserving the exact received validator for the next `If-None-Match` request and retaining all generation/pricing identity checks.
+- Root cause: the production gateway emits `W/"plugins-..."` for the compressed catalog response. The previous strong-only regular expression rejected that otherwise valid HTTP 200 response, and the local Host API surfaced the rejection as `plugin_backend_unavailable`.
+- No fallback catalog, server mutation, proxy workaround, or billing/Provider behavior was added.
+
+## Verification
+
+- Live catalog parsed through `parseMarketplaceCatalogPage`: HTTP 200, total 3, exact IDs `makelore.data-service`, `makelore.game-resource`, `makelore.web-search`.
+- Installed MakeLore is version 1.2.0 and its `app.asar` contains the Marketplace route, service composition, and production origin `https://square.nianxx.cn`.
+- Running local Host API is on `127.0.0.1:13210`; an unauthenticated shell probe correctly returns 401 and therefore cannot yet distinguish dispatcher/service from upstream failure.
+- Installed-session Electron probes returned HTTP 200 and the weak composite ETag; the exact source Marketplace client failed before the fix with `marketplace_response_invalid: invalid composite Marketplace ETag` and returned all three official Plugins after the fix.
+- TDD regression: the new weak-ETag/304-reuse case failed before the product change and passed after it.
+- `pnpm exec vitest run tests/unit/coding-plugin-marketplace-client.test.ts tests/unit/plugin-marketplace-routes.test.ts tests/unit/plugin-marketplace-store.test.ts tests/unit/plugin-marketplace-pages.test.tsx`: 4 files, 68 tests passed.
+- `pnpm test`: 214 files, 1761 tests passed, 2 expected skips; pressure test 1/1 passed.
+- `pnpm run typecheck`: passed.
+- `pnpm run lint:check`: 0 errors and 5 unchanged warnings outside this task.
+- `pnpm run build:vite`: Renderer, Main, Preload, and utility builds passed.
+- Scoped ESLint and `git diff --check`: passed.
+
+## Follow-ups
+
+- Integrate this task into the client main branch, rebuild the Windows artifact, and install/restart it. The currently installed MakeLore 1.2.0 artifact cannot pick up this source-only fix dynamically.
+
+## Promotion Candidates
+
+- None recorded.