The `features` MCP tool and the terminal's Features entry say each scheduled tool's last and next run #10201

For: the other half of #10050: an agent and the terminal see what the page shows, in the same words.

Done looks like:

• [x] features with slug returns schedule: [{ tool, every, lastAt, ok, error, nextAt }], nextAt from due's rule.
• [x] The terminal's Features palette entry shows the same line as the page, from the same function.
• [x] Tests for the tool's field and the terminal line.

Files: the features MCP tool, src/tui/, test/.

Reviewed pull #10278 at its head: ticked features with slug returns schedule: [{ tool, every, lastAt, ok, error, nextAt }], nextAt from due's rule.; The terminal's Features palette entry shows the same line as the page, from the same function.; Tests for the tool's field and the terminal line..