fix(import-detect): drop commented-out and relative imports

[eeshsaxena]

Three false positives in extractImportedPackages (the added-line import scanner feeding skill detection). Each makes it attribute a dependency the code doesn't actually import, which the module's "bounded false positives" contract is meant to prevent.

1. Commented-out imports inside a Go import (...) block

The single-line Go form already drops // import "..." via isRealStatement, but the block form scans every quoted path in the block body, comments included:

import (
	"fmt"
	// "github.com/spf13/cobra"  // temporarily disabled
	"github.com/gin-gonic/gin"
)

Before: ["fmt", "github.com/spf13/cobra", "github.com/gin-gonic/gin"] — the commented-out cobra is credited.
After: ["fmt", "github.com/gin-gonic/gin"].

The block body now skips isCommentLine lines, matching the single-line path.

2. JS relative/absolute specifiers leak . / ..

normalizeJs("./util") returns "." (and "../lib/x" returns ".."), so every relative import adds a bogus token:

import { a } from "./util";
import b from "../lib/x";
import c from "react";

Before: [".", "..", "react"] · After: ["react"]

3. Python relative from-imports leak ""

from . import x / from .models import Y split to an empty first segment, pushed unguarded (the sibling import branch already guards with if (name)):

from . import helpers
from .models import User
import django

Before: ["", "", "django"] · After: ["django"]

#2 and #3 are the same "a relative module is not a package" case that Ruby's require_relative and Rust's crate/self/super are already excluded for; JS and Python just weren't.

Tests

Adds three regression tests to test/import-detect.test.ts (one per case). They fail on main and pass with this change; the full import-detect suite stays green (90 passed).

[eeshsaxena]

Hi! Gentle nudge on this one whenever you have some bandwidth. It's a small, self-contained fix (fix(import-detect): drop commented-out and relative imports), and it's currently mergeable with no conflicts. No urgency at all, and I'm happy to make any changes you'd like. Thanks for maintaining redential-cli!