chore(security): override brace-expansion to fix the failing audit

[clay-good]

Status: ready to merge — audits clean, website builds, all 2,279 tests pass.

What was wrong: The Security workflow has failed on every run on main since 2026-07-27. A new advisory (GHSA-mh99-v99m-4gvg, high severity) flags brace-expansion <= 5.0.7, and both lockfiles resolve a vulnerable version: 5.0.7 at the root and 1.1.16 in website/ (via minimatch@3, which pins ^1.1.7 — the only patched release is 5.0.8, so a plain update can't reach it).

How it was fixed: Ran pnpm audit --fix in both packages. It adds a scoped override, "brace-expansion@<=5.0.7": ">=5.0.8", to each package.json (next to the existing postcss/sharp overrides in website/). The lockfile diffs touch only brace-expansion and its own subtree. No change to the audit workflow — it caught a real advisory.

Proof:

• Before: pnpm audit --audit-level high --dir website exits 1 (same failure as the Security run on main).
• After: both pnpm audit --audit-level high and pnpm audit --audit-level high --dir website print No known vulnerabilities found.
• pnpm --dir website build succeeds; root pnpm build + vitest run pass (112 files, 2,279 tests).

Notes: The forced 1.x → 5.x jump in website/ only affects serve-handler (the serve out preview script; not part of the Next build). brace-expansion 5.x changed its export shape, so brace patterns like {a,b} in serve-handler globs would break — we use serve with no config, so no such patterns exist. The override can be dropped once minimatch/serve move off the 1.x line.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Updated install dependency resolution to ensure a compatible brace-expansion version is selected.
  • Applied the same brace-expansion version resolution safeguard to the website package configuration.
• Chores
  • Updated the Nix flake’s pinned dependency fetch integrity hash used during builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 0ae5ce3 and b3d39fc.

📒 Files selected for processing (1)

• flake.nix

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📝 Walkthrough

Walkthrough

Adds matching pnpm.overrides entries to the root and website package configurations, requiring brace-expansion versions at least 5.0.8, and updates the Nix pnpm dependency fetch hash.

Changes

Dependency Configuration

Layer / File(s)	Summary
Configure brace-expansion resolution package.json, website/package.json	Adds pnpm.overrides mappings for brace-expansion@<=5.0.7 to >=5.0.8; the website retains its existing sharp override.
Update pnpm dependency fetch flake.nix	Replaces the pnpmDeps fetch hash with a new pinned SHA-256 value.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• Fission-AI/OpenSpec#1249: Modifies the same flake.nix pnpm dependency fetch configuration.
• Fission-AI/OpenSpec#1427: Changes the hash used by pkgs.fetchPnpmDeps.
• Fission-AI/OpenSpec#1457: Changes the pnpmDeps fetch hash in the packages derivation.

Suggested reviewers: alfred-openspec

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main security fix by overriding brace-expansion to resolve the failing audit.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/brace-expansion-audit-fix

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[cloudflare-workers-and-pages]

Deploying openspec-docs with    Cloudflare Pages

Latest commit:	39d71d1
Status:	✅  Deploy successful!
Preview URL:	https://d2280d9c.openspec-docs.pages.dev
Branch Preview URL:	https://chore-brace-expansion-audit.openspec-docs.pages.dev

View logs

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@flake.nix`:
- Line 54: Replace the empty hash assigned to pnpmDeps.hash with the concrete
sha256 value generated by running scripts/update-flake.sh after the lockfile
changes, then commit the updated hash so the fixed-output derivation builds
successfully.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 1e6153e5-2d5f-4e07-be8b-16e0b29ae40f

📥 Commits

Reviewing files that changed from the base of the PR and between 39d71d1 and 0ae5ce3.

📒 Files selected for processing (1)

• flake.nix

[alfred-openspec]

Reviewed at b3d39fc. Both audits are clean, the root and website builds pass, the Nix hash is green, the cross-platform 2,279-test CI suite passes, and I verified the affected serve out preview returns both the homepage and a docs route successfully.