Remove cog migrate command and dead code (#2667)

The cog migrate command was a hidden command used to migrate projects
to fast boot compatibility. This removes:

- pkg/cli/migrate.go - CLI command definition
- pkg/migrate/ - entire migration package (7 files)
- pkg/coglog/migrate_log_context.go - migration telemetry context
- python/cog/command/migrate_v1_v1fast.py - Python AST transformer
- Integration tests for migration (3 files)
- Documentation for cog migrate in docs/cli.md and docs/llms.txt
- Migration telemetry methods from pkg/coglog/client.go

Author: michaeldwan

docs/cli.md

@@ -285,31 +285,6 @@ cog login
 echo $REPLICATE_API_TOKEN | cog login --token-stdin
 ```
 
-### cog migrate
-
-Run a migration to update project to newer Cog version.
-
-```
-cog migrate [options]
-```
-
-**Flags:**
-
-| Flag | Type | Default | Description |
-|------|------|---------|-------------|
-| `-y` | bool | false | Disable interaction and automatically accept changes |
-| `-f` | string | cog.yaml | The name of the config file |
-
-**Examples:**
-
-```bash
-# Run migration interactively
-cog migrate
-
-# Run migration automatically accepting all changes
-cog migrate -y
-```
-
 ### cog debug
 
 Generate a Dockerfile from cog configuration.

docs/llms.txt

@@ -495,31 +495,6 @@ cog login
 echo $REPLICATE_API_TOKEN | cog login --token-stdin
 ```
 
-### cog migrate
-
-Run a migration to update project to newer Cog version.
-
-```
-cog migrate [options]
-```
-
-**Flags:**
-
-| Flag | Type | Default | Description |
-|------|------|---------|-------------|
-| `-y` | bool | false | Disable interaction and automatically accept changes |
-| `-f` | string | cog.yaml | The name of the config file |
-
-**Examples:**
-
-```bash
-# Run migration interactively
-cog migrate
-
-# Run migration automatically accepting all changes
-cog migrate -y
-```
-
 ### cog debug
 
 Generate a Dockerfile from cog configuration.

integration-tests/tests/migration.txtar

@@ -45,7 +45,6 @@ https://github.com/replicate/cog`,
 		newRunCommand(),
 		newServeCommand(),
 		newTrainCommand(),
-		newMigrateCommand(),
 		newPullCommand(),
 	)
 

integration-tests/tests/migration_gpu.txtar

@@ -35,16 +35,6 @@ type pushLog struct {
 	LocalImage bool    `json:"local_image"`
 }
 
-type migrateLog struct {
-	DurationMs          float32 `json:"length_ms"`
-	BuildError          *string `json:"error"`
-	Accept              bool    `json:"accept"`
-	PythonPackageStatus string  `json:"python_package_status"`
-	RunStatus           string  `json:"run_status"`
-	PythonPredictStatus string  `json:"python_predict_status"`
-	PythonTrainStatus   string  `json:"python_train_status"`
-}
-
 type pullLog struct {
 	DurationMs float32 `json:"length_ms"`
 	BuildError *string `json:"error"`
@@ -130,42 +120,6 @@ func (c *Client) EndPush(ctx context.Context, err error, logContext PushLogConte
 	return true
 }
 
-func (c *Client) StartMigrate(accept bool) *MigrateLogContext {
-	logContext := NewMigrateLogContext(accept)
-	return logContext
-}
-
-func (c *Client) EndMigrate(ctx context.Context, err error, logContext *MigrateLogContext) bool {
-	var errorStr *string = nil
-	if err != nil {
-		errStr := err.Error()
-		errorStr = &errStr
-	}
-	migrateLog := migrateLog{
-		DurationMs:          float32(time.Since(logContext.started).Milliseconds()),
-		BuildError:          errorStr,
-		Accept:              logContext.accept,
-		PythonPackageStatus: logContext.PythonPackageStatus,
-		RunStatus:           logContext.RunStatus,
-		PythonPredictStatus: logContext.PythonPredictStatus,
-		PythonTrainStatus:   logContext.PythonTrainStatus,
-	}
-
-	jsonData, err := json.Marshal(migrateLog)
-	if err != nil {
-		console.Warn("Failed to marshal JSON for build log: " + err.Error())
-		return false
-	}
-
-	err = c.postLog(ctx, jsonData, "migrate")
-	if err != nil {
-		console.Warn(err.Error())
-		return false
-	}
-
-	return true
-}
-
 func (c *Client) StartPull() PullLogContext {
 	logContext := PullLogContext{
 		started: time.Now(),