Remove OpenSSL runtime dependency from CLI binary (#94)

## Summary
- Disable git2 default features (`ssh`, `https`) which pulled in
`openssl-sys` and `libssh2-sys`
- These transports are unused — all git2 usage in the codebase is local
repo operations (commits, blobs, revwalks)
- The CLI binary no longer dynamically links against `libssl.3.dylib` /
`libcrypto.3.dylib`

Fixes #92

## Verification
- `otool -L target/debug/fabro | grep ssl` returns nothing (no OpenSSL
linkage)
- `cargo tree -i openssl-sys` returns nothing (fully removed from dep
tree)
- All 179 workspace tests pass

## Test plan
- [ ] Build release binary and verify with `otool -L` (macOS) or `ldd`
(Linux) that no OpenSSL refs remain
- [ ] Run on a machine without OpenSSL v3 installed — should launch
without `dyld` error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -2130,8 +2130,6 @@ dependencies = [
  "libc",
  "libgit2-sys",
  "log",
- "openssl-probe 0.1.6",
- "openssl-sys",
  "url",
 ]
 
@@ -2872,9 +2870,7 @@ checksum = "c9b3acc4b91781bb0b3386669d325163746af5f6e4f73e6d2d630e09a35f3487"
 dependencies = [
  "cc",
  "libc",
- "libssh2-sys",
  "libz-sys",
- "openssl-sys",
  "pkg-config",
 ]
 
@@ -2906,20 +2902,6 @@ dependencies = [
  "vcpkg",
 ]
 
-[[package]]
-name = "libssh2-sys"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "220e4f05ad4a218192533b300327f5150e809b54c4ec83b5a1d91833601811b9"
-dependencies = [
- "cc",
- "libc",
- "libz-sys",
- "openssl-sys",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "libz-sys"
 version = "1.1.24"
@@ -3153,7 +3135,7 @@ dependencies = [
  "libc",
  "log",
  "openssl",
- "openssl-probe 0.2.1",
+ "openssl-probe",
  "openssl-sys",
  "schannel",
  "security-framework",
@@ -3582,12 +3564,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "openssl-probe"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d05e27ee213611ffe7d6348b942e8f942b37114c00cc03cec254295a4a17852e"
-
 [[package]]
 name = "openssl-probe"
 version = "0.2.1"
@@ -4437,7 +4413,7 @@ version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "612460d5f7bea540c490b2b6395d8e34a953e52b491accd6c86c8164c5932a63"
 dependencies = [
- "openssl-probe 0.2.1",
+ "openssl-probe",
  "rustls-pki-types",
  "schannel",
  "security-framework",

Cargo.toml

@@ -33,7 +33,7 @@ tar = "0.4"
 cli-table = { version = "0.5", default-features = false }
 console = "0.15"
 dialoguer = "0.12"
-git2 = "0.20"
+git2 = { version = "0.20", default-features = false }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["fmt", "env-filter"] }
 tracing-appender = "0.2"