fix: spec2readme generates accurate README examples and documentation

Replace broken GPS Quick Start (Location is an empty stub) with working
PowerManager example. Replace GPS Usage Example with PowerManager and
ActivityManager examples that compile against actual API. Fix Generated
Code section: correct transaction offset (51 not 52), exported Remote
field, add defer _data.Recycle(), show version-aware ResolveCode pattern
and Method string constants. Auto-discover examples/ directory to keep
count and table in sync (13 including camera_connect). Replace GPS CLI
collapsible with power/battery CLI examples. All generated sections now
use marker pairs so make readme keeps them correct.

Author: xaionaro@dx.center

README.md

@@ -20,6 +20,8 @@ Includes a complete AIDL compiler that parses Android Interface Definition Langu
 
 ## Quick start
 
+<!-- BEGIN GENERATED QUICK_START -->
+
 **Go library** — `go get github.com/xaionaro-go/binder` and call any service:
 
 ```go
@@ -28,12 +30,13 @@ defer driver.Close(ctx)
 transport, _ := versionaware.NewTransport(ctx, driver, 0)
 sm := servicemanager.New(transport)
 
-mgr, _ := location.GetLocationManager(ctx, sm)
-loc, _ := mgr.GetLastLocation(ctx, string(location.ProviderFused),
-    location.LastLocationRequest{}, "com.android.shell")
-fmt.Printf("Lat: %.6f, Lon: %.6f\n", loc.LatitudeDegrees, loc.LongitudeDegrees)
+power, _ := os.GetPowerManager(ctx, sm)
+interactive, _ := power.IsInteractive(ctx)
+fmt.Printf("Screen on: %v\n", interactive)
 ```
 
+<!-- END GENERATED QUICK_START -->
+
 ## Related Projects
 
 <details>
@@ -100,11 +103,17 @@ All three libraries talk to the same Android system services, but through differ
 
 ## Usage Examples
 
-### Get GPS Coordinates
+<!-- BEGIN GENERATED USAGE_EXAMPLES -->
+
+### Check Power State
 
 ```go
 import (
-    "github.com/xaionaro-go/binder/android/location"
+    "context"
+    "fmt"
+    "log"
+
+    genOs "github.com/xaionaro-go/binder/android/os"
     "github.com/xaionaro-go/binder/binder"
     "github.com/xaionaro-go/binder/binder/versionaware"
     "github.com/xaionaro-go/binder/kernelbinder"
@@ -125,19 +134,16 @@ import (
     }
     sm := servicemanager.New(transport)
 
-    mgr, err := location.GetLocationManager(ctx, sm)
+    power, err := genOs.GetPowerManager(ctx, sm)
     if err != nil {
         log.Fatal(err)
     }
 
-    loc, err := mgr.GetLastLocation(ctx, string(location.ProviderFused),
-        location.LastLocationRequest{}, "com.android.shell")
-    if err != nil {
-        log.Fatal(err)
-    }
+    interactive, _ := power.IsInteractive(ctx)
+    fmt.Printf("Screen on: %v\n", interactive)
 
-    fmt.Printf("Lat: %.6f, Lon: %.6f\n", loc.LatitudeDegrees, loc.LongitudeDegrees)
-    fmt.Printf("Altitude: %.1f m\n", loc.AltitudeMeters)
+    powerSave, _ := power.IsPowerSaveMode(ctx)
+    fmt.Printf("Power save: %v\n", powerSave)
 ```
 
 ### List Binder Services
@@ -158,39 +164,50 @@ import (
     }
 ```
 
-### Call a System Service (PowerManager)
+### Call a System Service (ActivityManager)
 
 ```go
-import "github.com/xaionaro-go/binder/android/os"
+import (
+    "github.com/xaionaro-go/binder/android/app"
+    "github.com/xaionaro-go/binder/servicemanager"
+)
 
-    pm, err := os.GetPowerManager(ctx, sm)
+    svc, err := sm.GetService(ctx, servicemanager.ActivityService)
     if err != nil {
         log.Fatal(err)
     }
+    am := app.NewActivityManagerProxy(svc)
 
-    interactive, _ := pm.IsInteractive(ctx)
-    fmt.Printf("Screen on: %v\n", interactive)
+    limit, _ := am.GetProcessLimit(ctx)
+    fmt.Printf("Process limit: %d\n", limit)
 
-    powerSave, _ := pm.IsPowerSaveMode(ctx)
-    fmt.Printf("Power save: %v\n", powerSave)
+    monkey, _ := am.IsUserAMonkey(ctx)
+    fmt.Printf("Is monkey: %v\n", monkey)
 ```
 
 More examples: [`examples/`](examples/)
 
+<!-- END GENERATED USAGE_EXAMPLES -->
+
+<!-- BEGIN GENERATED EXAMPLES_TABLE -->
+
 | Example                                                    | Queries                                             |
 | ---------------------------------------------------------- | --------------------------------------------------- |
-| [`list_services`](examples/list_services/)                 | Enumerate all binder services, ping each            |
-| [`activity_manager`](examples/activity_manager/)           | Process limits, monkey test flag, permission checks |
-| [`battery_health`](examples/battery_health/)               | Capacity, charge status, current draw               |
-| [`device_info`](examples/device_info/)                     | Device properties, build info                       |
-| [`display_info`](examples/display_info/)                   | Display IDs, brightness, night mode                 |
-| [`audio_status`](examples/audio_status/)                   | Audio device info, volume state                     |
-| [`power_status`](examples/power_status/)                   | Power supply state, charging info                   |
-| [`storage_info`](examples/storage_info/)                   | Storage device stats, mount points                  |
-| [`package_query`](examples/package_query/)                 | Package list, installation info                     |
-| [`softap_manage`](examples/softap_manage/)                 | WiFi hotspot enable/disable, config                 |
-| [`softap_wifi_hal`](examples/softap_wifi_hal/)             | WiFi chip info, AP interface state                  |
-| [`softap_tether_offload`](examples/softap_tether_offload/) | Tethering offload config, stats                     |
+| [`activity_manager`](examples/activity_manager/) | Process limits, monkey test flag, permission checks |
+| [`audio_status`](examples/audio_status/) | Audio device info, volume state |
+| [`battery_health`](examples/battery_health/) | Capacity, charge status, current draw |
+| [`camera_connect`](examples/camera_connect/) | Camera device connection with callback stub |
+| [`device_info`](examples/device_info/) | Device properties, build info |
+| [`display_info`](examples/display_info/) | Display IDs, brightness, night mode |
+| [`list_services`](examples/list_services/) | Enumerate all binder services, ping each |
+| [`package_query`](examples/package_query/) | Package list, installation info |
+| [`power_status`](examples/power_status/) | Power supply state, charging info |
+| [`softap_manage`](examples/softap_manage/) | WiFi hotspot enable/disable, config |
+| [`softap_tether_offload`](examples/softap_tether_offload/) | Tethering offload config, stats |
+| [`softap_wifi_hal`](examples/softap_wifi_hal/) | WiFi chip info, AP interface state |
+| [`storage_info`](examples/storage_info/) | Storage device stats, mount points |
+
+<!-- END GENERATED EXAMPLES_TABLE -->
 
 ## bindercli Quick Start
 
@@ -1009,6 +1026,7 @@ See the full [bindercli reference](#bindercli) for all subcommands and more exam
 
 </details>
 
+
 <!-- END GENERATED PACKAGES -->
 
 ### Commands and Tools
@@ -1073,31 +1091,28 @@ bindercli service transact SurfaceFlinger 64
 </details>
 
 <details>
-<summary>Get GPS coordinates</summary>
+<!-- BEGIN GENERATED BINDERCLI_POWER -->
+
+<summary>Query power and battery state</summary>
 
 ```bash
-# List all location providers
-bindercli android.location.ILocationManager get-all-providers
-# Example output: {"result":["passive","network","fused","gps_hardware","gps"]}
-
-# Check if GPS provider is enabled
-bindercli android.location.ILocationManager is-provider-enabled-for-user \
-  --provider gps --userId 0
-
-# Get GNSS hardware info
-bindercli android.location.ILocationManager get-gnss-hardware-model-name
-# Example output: {"result":"S.LSI,K041,SPOTNAV_4.15.4_9_250930_R1_291847"}
-
-bindercli android.location.ILocationManager get-gnss-year-of-hardware
-# Example output: {"result":2023}
-
-# Get last known GPS location (returns Location parcelable with lat/lon/alt)
-bindercli android.location.ILocationManager get-last-location \
-  --provider gps \
-  --packageName com.android.shell \
-  --attributionTag ""
+# Check if screen is on
+bindercli android.os.IPowerManager is-interactive
+# Example output: {"result":true}
+
+# Check power save mode
+bindercli android.os.IPowerManager is-power-save-mode
+# Example output: {"result":false}
+
+# Check if device is in Doze mode
+bindercli android.os.IPowerManager is-device-idle-mode
+# Example output: {"result":false}
+
+# Get battery health info
+bindercli android.hardware.health.IHealth get-health-info
 ```
 
+<!-- END GENERATED BINDERCLI_POWER -->
 </details>
 
 <details>
@@ -1471,6 +1486,8 @@ flowchart TD
 
 ### Generated Code
 
+<!-- BEGIN GENERATED GENERATED_CODE -->
+
 For an AIDL interface like:
 
 ```java
@@ -1493,8 +1510,14 @@ package app
 const DescriptorIActivityManager = "android.app.IActivityManager"
 
 const (
-    TransactionIActivityManagerGetProcessLimit = binder.FirstCallTransaction + 52
-    TransactionIActivityManagerCheckPermission = binder.FirstCallTransaction + 8
+    TransactionIActivityManagerGetProcessLimit  = binder.FirstCallTransaction + 51
+    TransactionIActivityManagerCheckPermission  = binder.FirstCallTransaction + 8
+    // ...
+)
+
+const (
+    MethodIActivityManagerGetProcessLimit  = "getProcessLimit"
+    MethodIActivityManagerCheckPermission  = "checkPermission"
     // ...
 )
 
@@ -1506,19 +1529,25 @@ type IActivityManager interface {
 }
 
 type ActivityManagerProxy struct {
-    remote binder.IBinder
+    Remote binder.IBinder
 }
 
 func NewActivityManagerProxy(remote binder.IBinder) *ActivityManagerProxy {
-    return &ActivityManagerProxy{remote: remote}
+    return &ActivityManagerProxy{Remote: remote}
 }
 
 func (p *ActivityManagerProxy) GetProcessLimit(ctx context.Context) (int32, error) {
     var _result int32
     _data := parcel.New()
+    defer _data.Recycle()
     _data.WriteInterfaceToken(DescriptorIActivityManager)
 
-    _reply, _err := p.remote.Transact(ctx, TransactionIActivityManagerGetProcessLimit, 0, _data)
+    _code, _err := p.Remote.ResolveCode(ctx, DescriptorIActivityManager, MethodIActivityManagerGetProcessLimit)
+    if _err != nil {
+        return _result, fmt.Errorf("resolving %s.%s: %w", DescriptorIActivityManager, MethodIActivityManagerGetProcessLimit, _err)
+    }
+
+    _reply, _err := p.Remote.Transact(ctx, _code, 0, _data)
     if _err != nil {
         return _result, _err
     }
@@ -1536,6 +1565,8 @@ func (p *ActivityManagerProxy) GetProcessLimit(ctx context.Context) (int32, erro
 }
 ```
 
+<!-- END GENERATED GENERATED_CODE -->
+
 ### Supported AIDL Constructs
 
 | Construct         | Example                                         | Generated Go                               |
@@ -1692,6 +1723,6 @@ A [weekly workflow](.github/workflows/check-aosp-updates.yml) checks for new AOS
 │   ├── hardware/             HAL interfaces
 │   └── ...                   666 packages total
 ├── com/                      AOSP com.android.* service proxies
-├── examples/                 12 runnable examples
+├── examples/                 13 runnable examples
 └── .github/workflows/        CI configuration
 ```