Show per-action token usage in CLI output

Problem

After each action (tool call, response), the CLI only shows cumulative token usage in the status bar. There's no per-action breakdown visible. /cost shows model distribution (e.g. "opus: 97%, haiku: 3%") and cache hit rate, but no absolute token numbers.

This makes it impossible to understand:

• How many tokens a specific action consumed (e.g. a large Docker pull log vs. a simple file read)
• Whether a particular approach was "expensive" or not
• Where to optimize usage

Proposal

Show per-action token delta after each response, e.g.:

[+1.2k tokens · input: 800 · output: 400]

This would help users:

• Make informed decisions about whether to let large outputs into context
• Understand the cost of different workflows
• Budget their usage more effectively

Context

Even a simple question costs ~500 tokens, which is only visible if you happen to watch the status bar. As AI usage costs affect everyone, transparency should be a priority.

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