booking-guidance: add per-program fee profiles before booking flow

[BarnNorth]

Part of a series of improvements from a real transatlantic award booking session (see also #14).

Problem

Flying Blue was recommended for a CDG→LAX return without any mention that French departure taxes + YQ surcharges add ~$370/person in fees — nearly 3x the Aeroplan fees paid on the outbound leg. This only became visible on the Air France booking page, after Paris was already locked in as the end city of a 3-week honeymoon itinerary.

The fee profiles for major programs exist nowhere in the skill. A user following the booking flow has no way to factor fees into the program selection decision until it's too late to reconsider the departure city.

Changes

Add a Program Fee Profiles table immediately before the General Booking Flow section — so it's the first thing consulted, not an afterthought. Covers YQ pass-through policy, typical fees per person, and a key rule about high-tax departure cities (CDG, LHR).

Before / After

Before: Skill recommends Flying Blue for CDG→LAX. User goes to airfrance.com to book. Discovers $370/pp in fees on the confirmation page.

After: Before recommending any program, skill surfaces:

Program	YQ Surcharge?	Typical fees/pp	Notes
Aeroplan	No	$50–100	No YQ pass-through on Star Alliance partners
Flying Blue	Yes	$300–400	AF passes full surcharge + France adds ~$200/pp departure tax
...

User sees the fee delta before committing to a departure city.

Test plan

• bash scripts/smoke-test.sh --quick — 0 new failures (2 pre-existing on upstream main)
• All 44 skills have valid frontmatter
• README and llms.txt unchanged (no frontmatter edits)