Neutralize public fixture path examples

[svy04]

Summary

• Replace raw Windows user-home path examples in public source/test fixtures with generated or neutral wording.
• Keep path parsing, public hygiene, and remote-surface detection coverage intact.
• Avoid committing product-quality report churn from local verification.

Verification

• bun install --frozen-lockfile
• bun test src/utils/attachments.extractors.test.ts
• node --test vscode-extension/openclaude-vscode/src/presentation.test.js
• bun test scripts/product-github-remote-surface-audit.test.ts
• bun test scripts/product-vscode-startup-diagnostics.test.ts scripts/public-repo-readiness.test.ts
• bun run typecheck --pretty false
• bun run build
• bun run verify:privacy
• bun run product:quality exited 0; terminal condition remains PRODUCT_QUALITY_GATE_BLOCKED_BY_LOCAL_VSCODE_CLI_UNAVAILABLE as a local protected-environment boundary, not a readiness claim.
• git diff --check
• targeted public-path rg scan returned no matches