The old specs mocked promptLine/promptSecret and relied on the prompt path
being taken unconditionally — which is precisely the behavior #1394 removes
(non-TTY must NOT sit on prompts). Under vitest stdin is non-TTY, so the
new code correctly routed to piped-stdin credentials and the specs hung on
the unmocked reader (4/7 timeouts). The specs now mock the
piped-credentials seam with the same fixed values and assert that seam (not
the prompts) was consulted; titles state the actual path. All 7 pass; suite
1667/1667 (remaining local failure is the known host pi-invariant, CI pins
pi 0.84.1).
ensureSession credential resolution when sign-in is needed, in order:
1. explicit --email flag (highest)
2. non-TTY stdin: line 1 email, line 2 password (printf 'email\npassword\n' | …)
— for headless callers without argv access
3. interactive prompt (TTY only)
Precedence documented on ensureSession and in --help; headless with NO
credentials exits 2 with guidance instead of hanging on prompts.
Password never read from argv (ps-visible); stdin line kept untrimmed.
New piped-credentials.ts module so the reader is testable against real
streams (4 stream specs) while token-ops specs mock the seam (5 specs).