feat(schema): resolve symlinked schema directories

[benjymoses]

What it does

Adds a shared isSchemaDir() helper in resolver.ts and uses it everywhere schema directories are enumerated — the six discovery sites in listSchemas() / listSchemasWithInfo(), plus schema validate in schema.ts. The helper accepts real directories and symlinks whose target is a directory, while still rejecting symlinks-to-files and broken/dangling symlinks.

What it fixes

Schema discovery filtered directory entries with fs.Dirent.isDirectory(). That method reports the raw entry type from readdir, so a symlink returns false even when it points at a real directory. As a result, a symlinked schema directory placed in the user (~/.local/share/openspec/schemas), project, or package schema location was silently skipped — schemas could only be discovered as regular directories, never via symlink.

Before → After

~/.local/share/openspec/schemas/
└── my-schema -> /shared/team-schemas/my-schema   (symlink to a dir)

Before:  openspec schema list   →  (my-schema missing)
After:   openspec schema list   →  my-schema

Symlink-to-file and broken symlinks remain excluded in both cases.

Why it's safe to merge

• Purely widening. Real directories still take the fast path (entry.isDirectory() short-circuits); only symlink entries — previously dropped entirely — now get a statSync follow-up. No existing input changes behaviour.
• Defence in depth unchanged. The existing inner schema.yaml existence check still runs, so a symlinked dir without a valid schema.yaml is rejected exactly as a real dir would be.
• Broken symlinks handled. statSync throws ENOENT on dangling links; the helper catches it and returns false rather than propagating.
• Full suite passes (pnpm test); the resolver file is 47/47 including 9 new cases.

Notes for review

• The one remaining raw entry.isDirectory() is inside isSchemaDir itself — intentional, it's the helper's own directory check.
• isSchemaDir is exported so schema.ts reuses it rather than duplicating the statSync try/catch.
• Other readdirSync call sites (view.ts, spec.ts, and copyDirRecursive in schema.ts) were left untouched — they enumerate changes/specs or perform recursive copies, not schema discovery.
• Generated with Claude Code using claude-opus-4-8.

Summary by CodeRabbit

• Bug Fixes
  • Schema validation and discovery now correctly recognize schema directories even when they are symlinks.
  • Project, user, and built-in schemas are now included more reliably, while symlinks to files or broken links are ignored.
  • Schema listings and schema details now reflect symlinked directories consistently during validation and lookup.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: c58c063c-e0ac-4a77-a52e-feaa27b6c520

📥 Commits

Reviewing files that changed from the base of the PR and between 65a7233 and 20458d2.

📒 Files selected for processing (3)

• src/commands/schema.ts
• src/core/artifact-graph/resolver.ts
• test/core/artifact-graph/resolver.test.ts

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📝 Walkthrough

Walkthrough

Adds an exported isSchemaDir helper in the artifact-graph resolver that treats symlinks as valid schema directories when their target resolves to a directory via fs.statSync, returning false for broken symlinks. listSchemas, listSchemasWithInfo, and the schema validate command are updated to use this helper instead of entry.isDirectory(). Tests cover symlink scenarios.

Changes

Symlink-aware schema directory detection

Layer / File(s)	Summary
isSchemaDir helper src/core/artifact-graph/resolver.ts	New isSchemaDir(parentDir, entry) function resolves symlinks via fs.statSync, returning true for directories/valid symlinks-to-directories and false for broken symlinks.
Schema listing wiring src/core/artifact-graph/resolver.ts	listSchemas and listSchemasWithInfo replace entry.isDirectory() checks with isSchemaDir(...) across package, user, and project-local schema roots.
Schema validate command src/commands/schema.ts	Imports isSchemaDir and uses it in the schema validate loop to determine schema-directory eligibility.
Symlink test coverage test/core/artifact-graph/resolver.test.ts	New tests verify isSchemaDir behavior across real directories, symlinked directories, symlinks to files, broken symlinks, and regular files, plus symlink handling in listSchemas/listSchemasWithInfo.

Estimated code review effort: 2 (Simple) | ~12 minutes

Possibly related PRs

• Fission-AI/OpenSpec#411: Both PRs change schema directory discovery/listing logic in resolver.ts.
• Fission-AI/OpenSpec#522: Both PRs modify schema directory enumeration paths within listSchemas/listSchemasWithInfo.
• Fission-AI/OpenSpec#525: Both PRs touch the schema CLI validation path in src/commands/schema.ts.

Suggested reviewers: TabishB, 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 is concise and accurately summarizes the main change: resolving symlinked schema directories.
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

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