Charm Log v2

Add structured, leveled, colored logging to a Go CLI or TUI with Charm Log v2, including JSON and logfmt output, slog adapters, and plain-text log files from inside Bubble Tea.

Import as "charm.land/log/v2". Pinned and verified against v2.0.1. Go blocks headed // examples/... are trimmed from complete programs that build against the pinned modules; // excerpt blocks are API sketches.

If the project's go.mod still requires github.com/charmbracelet/log (pre-v2), the v2 APIs here do not apply. Use go doc against the project's version and keep its import paths unless the user asks to migrate.

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