feat: add directory-scoped host defaults (match_dirs) and repo list --limit

Add match_dirs field to host config entries for directory-based host
resolution. When no --hostname flag, FGJ_HOST env var, or git remote is
detected, the longest matching directory prefix determines the host.
Symlinks are resolved on both sides for macOS compatibility (/tmp →
/private/tmp). Also adds --limit/-L flag to repo list.

internal/config/config.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/spf13/viper"
 	"gopkg.in/yaml.v3"
@@ -14,10 +15,11 @@ type Config struct {
 }
 
 type HostConfig struct {
-	Hostname    string `yaml:"hostname"`
-	Token       string `yaml:"token"`
-	User        string `yaml:"user,omitempty"`
-	GitProtocol string `yaml:"git_protocol,omitempty"`
+	Hostname    string   `yaml:"hostname"`
+	Token       string   `yaml:"token"`
+	User        string   `yaml:"user,omitempty"`
+	GitProtocol string   `yaml:"git_protocol,omitempty"`
+	MatchDirs   []string `yaml:"match_dirs,omitempty"`
 }
 
 func GetConfigDir() (string, error) {
@@ -96,8 +98,9 @@ func (c *Config) SaveToPath(path string) error {
 // 2. CLI flag (--hostname)
 // 3. Environment variable (FGJ_HOST)
 // 4. Auto-detected hostname from git remote
-// 5. Default to codeberg.org
-func (c *Config) GetHost(hostname string, detectedHost string) (HostConfig, error) {
+// 5. match_dirs lookup (longest prefix match)
+// 6. Default to codeberg.org
+func (c *Config) GetHost(hostname string, detectedHost string, cwd string) (HostConfig, error) {
 	if hostname == "" {
 		hostname = viper.GetString("hostname")
 	}
@@ -110,6 +113,10 @@ func (c *Config) GetHost(hostname string, detectedHost string) (HostConfig, erro
 		hostname = detectedHost
 	}
 
+	if hostname == "" {
+		hostname = c.ResolveHostByPath(cwd)
+	}
+
 	if hostname == "" {
 		hostname = "codeberg.org"
 	}
@@ -122,6 +129,50 @@ func (c *Config) GetHost(hostname string, detectedHost string) (HostConfig, erro
 	return host, nil
 }
 
+// ResolveHostByPath finds the host whose match_dirs entry is the longest
+// prefix of cwd. Returns "" if no match is found.
+// Both cwd and match_dirs entries are resolved through filepath.EvalSymlinks
+// to handle symlinks (e.g. macOS /tmp → /private/tmp).
+func (c *Config) ResolveHostByPath(cwd string) string {
+	if cwd == "" {
+		return ""
+	}
+
+	// Resolve symlinks in cwd so /tmp becomes /private/tmp on macOS, etc.
+	if resolved, err := filepath.EvalSymlinks(cwd); err == nil {
+		cwd = resolved
+	}
+
+	bestHost := ""
+	bestLen := 0
+
+	for hostname, host := range c.Hosts {
+		for _, dir := range host.MatchDirs {
+			if dir == "" {
+				continue
+			}
+			// Resolve symlinks in the configured dir as well
+			if resolved, err := filepath.EvalSymlinks(dir); err == nil {
+				dir = resolved
+			}
+			// Normalize: ensure trailing slash for prefix matching
+			prefix := dir
+			if !strings.HasSuffix(prefix, "/") {
+				prefix += "/"
+			}
+			// Match if cwd equals dir exactly or is under it
+			if cwd == dir || strings.HasPrefix(cwd, prefix) {
+				if len(dir) > bestLen {
+					bestLen = len(dir)
+					bestHost = hostname
+				}
+			}
+		}
+	}
+
+	return bestHost
+}
+
 func (c *Config) SetHost(hostname string, host HostConfig) {
 	if c.Hosts == nil {
 		c.Hosts = make(map[string]HostConfig)