v0.5.0 key releases: key model, protocol source, console sources (#12)

* key model for releases: KeyAction, SetKeyReport, focus and key report events, hold pairing

A key event now carries its Action: KeyPress, KeyRepeat or KeyRelease. Every
terminal still reports presses only, so Action stays KeyPress and every event
is what v0.4.3 sent, until a game asks with SetKeyReport. The ask names the
sources releases may come from (KeySourceConsole, KeySourceProtocol); an
EventKeyReport answers each ask with the level reached and its source. No
source exists yet, so every ask answers presses and nothing is written.

KeyHolds pairs a release with its press by physical key, so a release carries
what its press carried, and turns a source's lost reports into Lost releases.
It is exported for hosts that read native key events (KeySourceHost).

The reader sends keys through the level in force: at presses a repeat is a
press and a release is dropped; at releases a key with no physical key behind
it is a tap. Focus reports end every hold, Lost, before EventFocus; they are
read only once a source turns them on. Mouse events gain a Touch bit for hosts.

Terminal gains SetKeyReport, so this is v0.5.0.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B3zCVjspRDuEuMrDTumVhp

* protocol source: releases from the terminal's key event protocol, Alacritty's

SetKeyReport with KeySourceProtocol asks the terminal whether it has the key
event protocol (CSI ? u, fenced by a DA1 request), pushes its flags (all five,
CSI > 31 u) and asks what they came to before reporting releases. A terminal
must confirm event types, every key as an escape code and the text keys type;
one that answers DA1 alone, takes the push without them, or answers nothing
within two seconds stays at presses, and is not asked again. Detection goes by
these answers only, never by TERM or the terminal's name.

While the flags are pushed, key reports are decoded into the events a legacy
terminal sends for the same keys, so a game can keep the protocol on for its
whole run: Shift goes into the character, Ctrl with a character into its
control key, Alt stays a modifier; Super, the locks, lone modifiers, media keys
and F13 and up report nothing. Ctrl with a character that has no control key
keeps ModCtrl. Releases pair with their presses through KeyHolds; a key the
terminal names none for (text from an input method) is a tap.

Focus reports come on with the protocol and end every hold, Lost, as focus
leaves. Going back to presses releases what is held, pops the flags and stops
focus reports, decoding until the terminal confirms the pop. Fini pops the
flags before the alternate screen goes, and EmergencyReset when they are
pushed. Fini now stops the input reader without holding the terminal's lock,
since the reader writes its requests through it.

Checked against Alacritty 0.13.2 on Xvfb with xdotool: 58 key combinations
read identically with the protocol on and off (Ctrl+1 keeps ModCtrl), every
press got its release, Shift released first still released 'A', focus loss
and a release swallowed by Alacritty's Vi mode ended holds Lost. Inside tmux
3.4 the ask came to presses.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B3zCVjspRDuEuMrDTumVhp

---------

Co-authored-by: Claude <noreply@anthropic.com>

key.go

@@ -90,6 +90,31 @@ const (
 	ModCtrl  Modifier = 1 << 2
 )
 
+// KeyAction is what happened to a key. Only a terminal reporting releases (see
+// SetKeyReport) tells them apart; elsewhere every key event is a press, and a
+// key held down arrives as more presses at the keyboard's repeat rate.
+type KeyAction uint8
+
+const (
+	KeyPress   KeyAction = iota // the key went down
+	KeyRepeat                   // the keyboard repeated a key held down
+	KeyRelease                  // the key came up
+)
+
+// String returns the action's name
+func (a KeyAction) String() string {
+	switch a {
+	case KeyPress:
+		return "Press"
+	case KeyRepeat:
+		return "Repeat"
+	case KeyRelease:
+		return "Release"
+	default:
+		return "None"
+	}
+}
+
 // escapeSequence maps escape sequences to keys
 // Key: sequence after ESC [ (e.g., "A" for up arrow)
 type escapeSequence struct {
@@ -392,4 +417,4 @@ func lookupSS3(seq []byte) (Key, Modifier, bool) {
 		return s.key, s.mod, true
 	}
 	return KeyNone, ModNone, false
-}
+}