wn: depend on openssl@3 and pkgconf so it builds on Linux

[erskingardner]

Follow-up to #1. The Linux leg of tap CI failed to build wn 0.9.1:

error: failed to run custom build command for `openssl-sys v0.9.115`
Could not find directory of OpenSSL installation
error: failed to compile `wn-cli v0.9.1`

Root cause

openssl-sys is a transitive dependency via rusqlite → libsqlite3-sys (SQLCipher-encrypted SQLite, the storage layer). It links against system OpenSSL. macOS build environments supply OpenSSL implicitly — the macOS legs and local builds passed — but the minimal ghcr.io/homebrew/brew:main Linux container does not, so the build script bailed. TLS already uses rustls; this is purely the SQLite encryption layer, so the native dep is genuinely required rather than removable.

Fix

• depends_on "openssl@3" — provides libcrypto for openssl-sys
• depends_on "pkgconf" => :build — lets the build script locate it

Passes brew style and brew audit --strict locally.

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/wn-openssl-linux

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Ready to review this PR? Stage has broken it down into 1 individual chapter for you:

	Title
1	Add OpenSSL and pkgconf dependencies for Linux builds

_{Chapters generated by Stage for commit 2c42c7b on Jul 6, 2026 12:48pm UTC.}