feat(cli): add wrap command for a should-I-wrap-now advisor

[jongio]

What

Adds a thermoworks wrap <serial> --target <F> command that advises whether to wrap the cook now (the Texas crutch). Wrapping in foil or butcher paper pushes meat through the stall faster and protects the bark, but wrap too early and the bark never sets.

The command reads the trailing probe history for a device and combines the current temperature, the wrap window, stall detection, and rate of climb into one call:

• wrap-now: inside the wrap window and either stalled or barely climbing
• hold: inside the window but still climbing well, so wrapping is optional
• below-window: under the wrap temperature, let the bark set first
• at-target: at or above the target, pull and rest instead
• no-data: no readings yet

How

• New pure SDK helper assessWrap in packages/sdk/src/wrap-advisor.ts. It reuses the existing detectStall and detectRapidChange detectors, so a wrap-now call lines up with an active stall. Side-effect free and unit tested.
• New CLI command packages/cli/src/commands/wrap.ts reads client.getHistory(serial), converts readings to Fahrenheit, and prints a human summary or --json.
• Readings come from the device history series, the same source as history and graph.

Flags

• --target F (required): target internal temperature
• --wrap-at F: temperature where the wrap window opens (default 160)
• --limit N: look at only the most recent N readings
• --json: machine-readable output

Tests

• packages/sdk/tests/wrap-advisor.test.ts: all five call paths plus custom wrap window and slow-rate threshold.
• packages/cli/tests/wrap.test.ts: arg parsing, formatting, Celsius conversion, limit, and the login/usage guards.
• SDK 486 tests pass, CLI 892 tests pass, typecheck clean, pnpm lint clean.

Closes #282