[Repo Assist] refactor(cmd): cobra UX improvements — NoArgs, MarkFlagFilename, preRun test fix

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Relates to #4379 (cobra module review — items P1, P2, P3)

Changes

1. Args: cobra.NoArgs on root command (root.go)

Without this, typing awmg config.toml (a common mistake) produces:

MCPG Error: required flag(s) "config" not set

With cobra.NoArgs, cobra gives a clear diagnostic before any validation runs:

Error: unknown command "config.toml" for "awmg"

This is a one-line change; it cannot affect normal usage (the root command runs with RunE: run, which takes no positional arguments).

2. Simplify file/directory completions (flags.go)

Replace four verbose RegisterFlagCompletionFunc lambdas with idiomatic cobra shorthands:

Before	After
RegisterFlagCompletionFunc("config", func(...) { return []string{"toml"}, FilterFileExt })	MarkFlagFilename("config", "toml")
RegisterFlagCompletionFunc("log-dir", func(...) { return nil, FilterDirs })	MarkFlagDirname("log-dir")
RegisterFlagCompletionFunc("payload-dir", func(...) { return nil, FilterDirs })	MarkFlagDirname("payload-dir")
RegisterFlagCompletionFunc("env", func(...) { return []string{"env"}, FilterFileExt })	MarkFlagFilename("env", "env")

Shell-completion behaviour is identical; the delta is −20 lines of boilerplate. MarkFlagFilename/MarkFlagDirname have been available since cobra v1.5; this project uses v1.10.2.

3. Fix fragile preRun(nil, nil) in tests (root_test.go)

Nine test cases called preRun(nil, nil). This works today because preRun never dereferences cmd. Any future addition that calls cmd.Context(), cmd.Flags(), or any other method will panic at nil. Replacing with preRun(&cobra.Command{}, nil) eliminates the footgun with zero test-logic change.

Test Status

⚠️ Infrastructure limitation: proxy.golang.org is blocked in this CI environment and Go 1.25.0 toolchain cannot be downloaded. This is a pre-existing issue affecting all Go builds in this environment.

The changes are:

• root.go: one struct-field addition (Args: cobra.NoArgs)
• flags.go: method call substitutions with identical semantics
• root_test.go: nil → &cobra.Command{} in 9 call sites (no logic change)

All three are syntactically straightforward refactors with no logic changes.

Warning

⚠️ Firewall blocked 1 domain

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• proxy.golang.org

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