fix: --mode rejected on seedance_2_0_mini, audio default, 480p price,…

[onedaydigital]

… portability

Six small fixes, each verified against higgsfield CLI v1.1.23 or arithmetic.

1. --mode std on seedance_2_0_mini is rejected outright:

   $ higgsfield generate cost seedance_2_0_mini --prompt test --mode std ...
   Error: Unknown params: mode
   Hint: Run: hf model get seedance_2_0_mini

   higgsfield model get seedance_2_0_mini has no mode param at all (unlike seedance_2_0, which has mode: std,fast). pipeline.md set VOPTS="--mode std --resolution 720p" for it, so the whole draft/previz tier fails at the first call. Also noted in the Step 4 model table.

2. generate_audio defaults to TRUE, so "do not pass --generate-audio" means audio is on, not off:

   $ higgsfield model get seedance_2_0
   generate_audio boolean true

   Now passes --generate-audio false on dives and connectors, and the gotcha is reworded. This is the same trap the Kling row already documents for sound: on. (The old note said the flag "errors on seedance"; it takes a boolean value fine.)

3. 480p Monid cell was the 4-second probe price, not an 8s dive. Every other cell reproduces the documented formula (wh24*s/1024) to the cent:

   720p 8s: 1280720248/1024 * $7/1M = $1.210 (doc: $1.21) ok
   1080p 8s: 19201080248/1024 * $7.7/1M = $2.994 (doc: $2.99) ok
   480p 8s: 854480248/1024 * $7/1M = $0.538 (doc: $0.28) <-- off
   480p 4s: 854480244/1024 * $7/1M = $0.269 (= the probe)

   The old figure also made the 5s connector ($0.35) cost more than the longer 8s dive at the same resolution. Corrected to $0.54 / $0.34 in SKILL.md and pipeline.md.

4. stat -f%z is macOS-only. On Linux it prints nothing, so sizeBytes is empty and the Monid /put body is malformed — the default backend's upload helper. Replaced with wc -c <.

5. Connector encode iterated conn_*.mp4 in glob order, so at N>=11 conn_10 sorts before conn_2 and gets written as conn2.mp4 — silently mis-ordering the chain. Now iterates by index.

6. .[]0.result_url typo in Step 2; the working expression used everywhere else in pipeline.md is .[0].result_url.

[onedaydigital]

Quick verification if useful — generate cost doesn't create a job or spend credits:

$ higgsfield generate cost seedance_2_0_mini --prompt test --mode std --resolution 720p --duration 8
Error: Unknown params: mode

$ higgsfield model get seedance_2_0_mini | grep -c mode
0 # vs seedance_2_0, which has mode std,fast

$ higgsfield model get seedance_2_0 | grep generate_audio
generate_audio boolean true

Checked against higgsfield CLI v1.1.23 (built 2026-08-08) on 2026-09-02.
The 480p arithmetic is in the commit message and needs no CLI at all.