feat(create): add gpu-create command with retry and fallback logic (#281)

* feat(create): add gpu-create command with retry and fallback logic

Add `brev create` command (aliases: provision, gpu-create) to create GPU
instances with automatic retry across multiple instance types.

Features:
- Smart defaults: auto-selects cheapest GPU meeting minimum specs
- Fallback chain: tries each type until all instances succeed
- Startup scripts: inline or @filepath syntax
- Parallel creation: --parallel flag for faster cluster creation
- Pipeable: reads types from stdin, outputs instance names

Examples:
  brev create my-instance
  brev search --gpu-name A100 | brev create my-box
  brev create my-cluster --count 3 --type g5.xlarge
  brev create my-instance --startup-script @setup.sh

* style: fix gofumpt formatting in workspace.go

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(cmd): remove duplicate create command from help output

* feat(create): add search filter flags to create command

Allow users to filter GPU instances directly in create (e.g. brev create
my-instance -g a100) instead of piping from brev search. Adds 12 filter
flags matching search: --gpu-name, --provider, --min-vram, --min-total-vram,
--min-capability, --min-disk, --max-boot-time, --stoppable, --rebootable,
--flex-ports, --sort, --desc. Defaults are preserved when no filters set.

* feat(create): add --dry-run flag to preview matching instance types

* refactor(create): simplify gpucreate with shared utilities and reduced duplication

- Deduplicate isStdoutPiped() by exporting from gpusearch
- Convert createWorkspaceWithType to createContext method (8 params → 2)
- Convert pollUntilReady to createContext method (6 params → 1)
- Add colorize() helper to eliminate piped-vs-colored branching
- Extract registerCreateFlags to fix funlen lint violation
- Wrap external DisplayResults error to fix wrapcheck lint
- Fix test to call parseTableInput directly instead of reimplementing
- Trim help examples from 15+ to 6 focused patterns
- Simplify resolveWorkspaceUserOptions branching

---------

Author: theFong

pkg/cmd/cmd.go

@@ -10,10 +10,10 @@ import (
 	"github.com/brevdev/brev-cli/pkg/cmd/configureenvvars"
 	"github.com/brevdev/brev-cli/pkg/cmd/connect"
 	"github.com/brevdev/brev-cli/pkg/cmd/copy"
-	"github.com/brevdev/brev-cli/pkg/cmd/create"
 	"github.com/brevdev/brev-cli/pkg/cmd/delete"
 	"github.com/brevdev/brev-cli/pkg/cmd/envvars"
 	"github.com/brevdev/brev-cli/pkg/cmd/fu"
+	"github.com/brevdev/brev-cli/pkg/cmd/gpucreate"
 	"github.com/brevdev/brev-cli/pkg/cmd/gpusearch"
 	"github.com/brevdev/brev-cli/pkg/cmd/healthcheck"
 	"github.com/brevdev/brev-cli/pkg/cmd/hello"
@@ -272,6 +272,7 @@ func createCmdTree(cmd *cobra.Command, t *terminal.Terminal, loginCmdStore *stor
 	cmd.AddCommand(workspacegroups.NewCmdWorkspaceGroups(t, loginCmdStore))
 	cmd.AddCommand(scale.NewCmdScale(t, noLoginCmdStore))
 	cmd.AddCommand(gpusearch.NewCmdGPUSearch(t, noLoginCmdStore))
+	cmd.AddCommand(gpucreate.NewCmdGPUCreate(t, loginCmdStore))
 	cmd.AddCommand(configureenvvars.NewCmdConfigureEnvVars(t, loginCmdStore))
 	cmd.AddCommand(importideconfig.NewCmdImportIDEConfig(t, noLoginCmdStore))
 	cmd.AddCommand(shell.NewCmdShell(t, loginCmdStore, noLoginCmdStore))
@@ -283,7 +284,6 @@ func createCmdTree(cmd *cobra.Command, t *terminal.Terminal, loginCmdStore *stor
 	cmd.AddCommand(secret.NewCmdSecret(loginCmdStore, t))
 	cmd.AddCommand(sshkeys.NewCmdSSHKeys(t, loginCmdStore))
 	cmd.AddCommand(start.NewCmdStart(t, loginCmdStore, noLoginCmdStore))
-	cmd.AddCommand(create.NewCmdCreate(t, loginCmdStore))
 	cmd.AddCommand(stop.NewCmdStop(t, loginCmdStore, noLoginCmdStore))
 	cmd.AddCommand(delete.NewCmdDelete(t, loginCmdStore, noLoginCmdStore))
 	cmd.AddCommand(reset.NewCmdReset(t, loginCmdStore, noLoginCmdStore))