Add game state debug log with binary ring buffer

Implement src/engine/debuglog module that records a comprehensive
snapshot of game state every tick into a 4 MB in-memory ring buffer.

Activated by --debug-log command-line flag. Press F12 during gameplay
to dump the ring buffer to a human-readable debug_log.txt file. The
buffer also auto-flushes every 10 seconds as a safety net.

Each tick snapshot captures: input state (held/pressed/released bitmasks),
full player state (position, velocity, health, dash, aim, timers),
camera position, physics globals, level name, and a variable-length
list of all active entity positions/velocities/health.

New files:
- src/engine/debuglog.h — API and snapshot data structures
- src/engine/debuglog.c — ring buffer, record, and dump logic

Modified files:
- include/config.h — DEBUGLOG_BUFFER_SIZE constant
- src/engine/input.h/c — input_get_snapshot() to pack input bitmasks
- src/engine/core.c — debuglog_record_tick() call after update
- src/main.c — CLI flag, init/shutdown, F12 hotkey, set_level calls

Closes #19

.gitea/workflows/deploy.yaml

@@ -19,14 +19,6 @@ jobs:
           git config --global http.https://git.kimchi.sslVerify false
           git clone --depth 1 https://${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_PASSWORD }}@git.kimchi/tas/major_tom.git .
 
-      - name: Debug registry auth
-        run: |
-          curl -s -D- http://git.kimchi/v2/ | head -15
-          TOKEN=$(curl -s "http://git.kimchi/v2/token?service=container_registry&scope=repository:tas/major_tom:push,pull" -u "${{
-          secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_PASSWORD }}" | jq -r .token)
-          echo "Token received: ${TOKEN:0:20}..."
-          curl -s -D- -H "Authorization: Bearer $TOKEN" http://git.kimchi/v2/tas/major_tom/tags/list | head -15
-
       - name: Build and push container image
         run: |
           set -ex
@@ -49,9 +41,10 @@ jobs:
       - name: Restart deployment on k3s
         run: |
           mkdir -p ~/.kube
-          echo "${{ secrets.KUBECONFIG }}" > ~/.kube/config
+          echo "${{ secrets.KUBECONFIG }}" | base64 -d > ~/.kube/config
           chmod 600 ~/.kube/config
+          kubectl delete pod -l app=${{ env.DEPLOYMENT }} -n ${{ env.NAMESPACE }}
 
           POD_NAME=$(kubectl get pods -l app=jnr-web -n jnr-web -o jsonpath='{.items[0].metadata.name}')
           echo "Deleting running pod" "$POD_NAME"
-          kubectl delete pod $POD_NAME -n jnr-web
+          

src/game/level.c

@@ -306,8 +306,7 @@ static void handle_collisions(EntityManager *em) {
         }
 
         /* ── Enemy contact damage to player ──── */
-        if (player && !(player->flags & ENTITY_INVINCIBLE) &&
-            entity_is_enemy(a) && !(a->flags & ENTITY_DEAD)) {
+        if (player && entity_is_enemy(a) && !(a->flags & ENTITY_DEAD)) {
             if (physics_overlap(&a->body, &player->body)) {
                 /* Check if player is stomping (falling onto enemy from above) */
                 bool stomping = (player->body.vel.y > 0) &&
@@ -319,7 +318,7 @@ static void handle_collisions(EntityManager *em) {
                     damage_entity(a, 2);
                     if (a->flags & ENTITY_DEAD) stats_record_kill();
                     player->body.vel.y = -PLAYER_JUMP_FORCE * 0.7f;
-                } else {
+                } else if (!(player->flags & ENTITY_INVINCIBLE)) {
                     /* Charger deals extra damage and knockback while charging */
                     int dmg = a->damage;
                     if (a->type == ENT_ENEMY_CHARGER) {

src/game/player.c

@@ -308,8 +308,8 @@ void player_update(Entity *self, float dt, const Tilemap *map) {
             pd->dash_timer = PLAYER_DASH_DURATION;
             pd->dash_dir   = vec2(0.0f, 1.0f);
 
-            /* Brief invincibility during dash */
-            pd->inv_timer = PLAYER_DASH_DURATION;
+            /* Invincibility during dash + short grace period after */
+            pd->inv_timer = PLAYER_DASH_DURATION + PLAYER_DASH_INV_GRACE;
             self->flags |= ENTITY_INVINCIBLE;
 
             /* Jetpack burst downward */

src/game/player.h

@@ -39,6 +39,7 @@
 
 /* Invincibility after taking damage */
 #define PLAYER_INV_TIME 1.5f       /* seconds of invincibility      */
+#define PLAYER_DASH_INV_GRACE 0.15f /* extra invincibility after dash */
 
 /* Aim direction (for shooting) */
 typedef enum AimDir {