Fix permanent input-timing desync; no i-frames; UI respawn; guard dead joins

The real cause of the ship/bullet separation, which the previous commit only
half-addressed. The server dropped inputs past a lead of 12 while the client
only re-synced past 16, so a client whose lead drifted into 13-16 had every
input silently rejected while believing its timing was fine. The server coasted
on held_input and then stopped; the client kept predicting. The two separated
permanently and the reconciler fought it every snapshot -- "shoved around".
It needed two independent clocks to drift, hence "only after some time", and
nothing in the loop could notice, hence "then persists". The listen-server
diagnostic could never reproduce it: one process, one physics tick, lead
constant by construction.

Two defences: INPUT_MAX_LEAD (40) is now far wider than the client's correction
band (3..20), asserted by tests/unit/test_input_lead.gd so narrowing it fails a
test; and an ack-stall detector re-syncs when last_input_tick stops advancing,
which catches the whole class regardless of cause -- lead alone cannot, because
a wrong lead looks normal from the client. diag_prediction.gd now injects a +14
tick drift and exits non-zero unless the gap recovers.

Also:
- No invulnerability frames. Every bullet that touches a player lands; i-frames
  made dense patterns safer than sparse ones, which inverts the genre. Measured:
  a stationary player survives ~13.6s of the Warden's opening phase, ~17.5s
  drifting. spawn_grace remains the only invulnerable state.
- Death is exited with a HUD button, disabled for the first 3s. The lockout is
  enforced in SimWorld, not just by graying the button -- a client that ignores
  its own UI still waits. The interact key no longer respawns.
- Joining a server that is not there no longer drops the player into an empty
  lobby they cannot act in. Net.join() only creates an ENet object; the game
  scene now waits for the server to actually place us in an instance, with an
  8s timeout, and headless runs exit non-zero instead of idling.

Protocol 2 -> 3. 98 tests; check.sh, test.sh and smoke.sh all pass.

tests/unit/test_emergency_escape.gd

@@ -9,7 +9,6 @@ const PEER := 3
 func before_each() -> void:
 	world = SimWorld.new(1)
 	world.add_player(PEER, "tester")
-	world.players[PEER].iframes = 0
 
 
 func _hold_escape(ticks: int) -> void:
@@ -65,7 +64,6 @@ func test_dying_ends_the_channel() -> void:
 	_hold_escape(20)
 	var p: SimPlayer = world.players[PEER]
 	p.hp = 1
-	p.iframes = 0
 	world.pool.spawn(p.pos, Vector2.ZERO, 6.0, 60, 999,
 		SimConfig.TEAM_ENEMY, SimConfig.KIND_ORB)
 	world.step()
@@ -91,7 +89,6 @@ func test_a_linkdead_player_is_still_killable_while_channelling() -> void:
 	var p: SimPlayer = world.players[PEER]
 	p.linkdead = true
 	p.hp = 1
-	p.iframes = 0
 	world.step()
 	world.pool.spawn(p.pos, Vector2.ZERO, 6.0, 60, 999,
 		SimConfig.TEAM_ENEMY, SimConfig.KIND_ORB)