Operator runs Ghostty (also iTerm2, modern Terminal.app) — all support
cmd+click on file:// URLs. Producing commands (/trekbrief, /trekplan,
/trekreview) already emit both forms but the contract was implicit.
This commit makes it explicit:
1. CLAUDE.md gains an "Operator-UX guarantee" paragraph stating both
forms must always appear in the final report: (a) plain file://
URL with absolute path (for cmd+click), (b) copy-pasteable
`open file://` command (for terminals without cmd+click).
2. tests/lib/doc-consistency.test.mjs gains a pin asserting both
patterns appear in all three producing commands' final report
blocks. Drift catches at test time.
Non-functional change to the commands themselves — they already
emit both forms (verified at trekbrief.md L510/L519, trekplan.md
L798/L802, trekreview.md L299/L317).
Operator request 2026-05-13: "Noter ned i Voyage at jeg ALLTID får
en slik direkte file:// lenke."