fix(cli): detect workspace dependencies in skills suggest

[officialasishkumar]

Summary

• detect pnpm-workspace.yaml package patterns when scanning dependencies for ctx7 skills suggest
• support package.json workspaces arrays and workspaces.packages object syntax, including negated patterns
• aggregate workspace package dependencies with existing root JavaScript and Python dependency detection
• add regression tests covering pnpm, npm/yarn workspace syntax, exclusions, and existing root dependency behavior
• add a changeset for ctx7

Fixes #1860

Validation

• corepack pnpm --filter ctx7 test -- src/tests/deps.test.ts
• corepack pnpm --filter ctx7 typecheck
• corepack pnpm --filter ctx7 lint:check
• corepack pnpm --filter ctx7 format:check
• corepack pnpm --filter ctx7 build