Xaelion Additions 2.8.0-beta.9: Alystia, The Sovereign's Frostway (Stage 1)

Alystia can now fly. This is the movement core only: all four modes, the keys, the safety limits and a plain test readout.
There's no art yet, so she flies in a placeholder pose with no ice road. Alystia is now version 0.7.1, and all 40 powers are
unchanged. This build needs testing on the real Xaelion server. Singleplayer skips the movement check that this stage has to pass, so
the speeds aren't proven until it's flown there. The checklist is at the end of this file.

How to fly

She must be transformed. These keys do nothing for other characters, and all of them can be changed in Controls under "Alystia".

Key	What it does
G	Take off, or land (press again to cancel a landing)
X / C	Faster mode / slower mode
V	The First Winter's Descent, the burst
W A S D	Move. She goes where the mouse points
Space / Shift	Straight up / straight down
Left Alt	Brake. Hold it with a direction for slow, precise movement

Mode	Top speed	Notes
Sovereign's Glide	22 b/s	She starts here
Glacial Waltz	65 b/s
Winter's Comet	150 b/s	No cooldown
The First Winter's Descent	240 b/s	3 second burst, flies where you look, then drops to Comet. 30 second cooldown

All four speeds, the burst length and its cooldown are in the server config. Landing and taking off again doesn't reset the
cooldown. The Frostway isn't a numbered power and doesn't take a wheel slot.

What's in place

• Steering: smooth speed changes, full 3D, momentum through turns, and a dead stop with no drift when you let go.
• Never outrunning the land: she always keeps enough loaded land ahead to stop in, so she slows down instead of flying
  into unloaded chunks. This is checked on both the server and her own client.
• Terrain: she slows for solid ground ahead and slides along it if she touches it.
• A struggling server: she eases off if the server falls behind 20 ticks a second.
• No fall damage, and no world changes. Flight places no blocks at all.
• Ending a flight: flight ends if she reverts, dies, logs out, mounts something, sleeps or goes into spectator. If she's in
  the air she drifts down safely. She won't take off from a saddle or a bed.
• Administration: "The Sovereign's Frostway" is a new entry you can lock, and it can also go in disabledPowers. A lock ends
  a flight already in progress within 2 seconds.
• Cheating: a client flying far over its limit has its flight ended.

The test readout

A plain readout appears at the top left while she flies. It's temporary: Stage 5 replaces it with the real Cryo HUD. You can
turn it off with frostwayHud in the client config.

• Her mode, her speed and her current limit
• held by: what's limiting her (nothing, server, unloaded land or terrain ahead)
• Burst status
• Her peak speed, and pulled back, which counts any time the server rubber-banded her

Each flight also writes a line to logs/latest.log starting Frostway flight:, with its time, peak speed, average speed, how
much of it was limited, and how many times she was pulled back.

What's been tested

Tested offline only. Nothing here has run in the game yet.

• All 1,798 automated checks pass, 233 of them new.
• Simulated flights through every mode reached their top speeds and never went over them.
• 20 simulated flights ran with uneven packet timing and two quarter-second server stalls. Vanilla's movement check, recreated
  from its code, rejected nothing.
• Flying at land loading at 0, 10, 50 and 100 b/s, she never passed the edge of it.
• A simulated client flying at double its limit had its flight ended.
• The jar is installed in both instances and matches the build.

Not yet tested: real flight, the keys, the feel of the steering, the readout, and anything on a real server. The 240 b/s
burst is the most likely thing to need changing. If it rubber-bands, the agreed fallback is 180 b/s.

Coming in the next stages

The ice road, hover sigil, sounds, 14 animations, Comet and Descent effects, takeoff and arrival, the Cryo HUD, and using
Frostfall while flying. Stage 2 starts once the speeds are settled.

⚠ Flashback

Flashback replays made with this version should open normally, but flight is untested in a recording. Stage 1 has no effects to
record, and her placeholder pose may not show up on other players who were far away when she took off.

Real-server test checklist

Put xaelion-additions-2.8.0-beta.9.jar on the server as well. Singleplayer can't test this. Take the first flight over
ground nobody has explored yet if you can, because that's the hardest case for the server.

1. Each mode: press G, then X up to Comet, and fly in a straight line for 30 seconds. Does the readout reach 22, 65 and 150?
2. The burst: press V over open land. Does it reach 240? Does pulled back stay at 0?
3. New land: fly at Comet into unexplored terrain for at least a minute, then again with the burst. Do you see holes in the
   world? What does held by say, and what speed does it settle at?
4. Steering: do turns, dives and climbs feel right? Is a sharp turn at Comet too slow or too twitchy?
5. Hover: let go of everything for 30 seconds. Does she stay perfectly still?
6. Terrain: fly at a mountain, then skim low over a forest. Does she slow down too early or too late?
7. Land: press G at Comet. Then press G high up in Glide and check she drifts down with no fall damage.
8. Getting cut off: revert while flying. Then lock "The Sovereign's Frostway" in the Administration while flying.
9. Another player: do they see her move smoothly at full speed?
10. Server health: did anyone else lag, and did the server log say moved too quickly or moved wrongly?

Send me: the Frostway flight: lines from logs/latest.log, plus anything that felt wrong. The peak speeds and pulled-back
counts decide the final speeds.