PICK SKY overlay: D3 natal wheel, Character model, PySwiss aspects+tz

PySwiss:
- calculate_aspects() in calc.py (conjunction/sextile/square/trine/opposition with orbs)
- /api/tz/ endpoint (timezonefinder lat/lon → IANA timezone)
- aspects included in /api/chart/ response
- timezonefinder==8.2.2 added to requirements
- 14 new unit tests (test_calc.py) + 12 new integration tests (TimezoneApiTest, aspect fields)

Main app:
- Sign, Planet, AspectType, HouseLabel reference models + seeded migrations (0032–0033)
- Character model with birth_dt/lat/lon/place, house_system, chart_data, celtic_cross,
  confirmed_at/retired_at lifecycle (migration 0034)
- natus_preview proxy view: calls PySwiss /api/chart/ + optional /api/tz/ auto-resolution,
  computes planet-in-house distinctions, returns enriched JSON
- natus_save view: find-or-create draft Character, confirmed_at on action='confirm'
- natus-wheel.js: D3 v7 SVG natal wheel (elements pie, signs, houses, planets, aspects,
  ASC/MC axes); NatusWheel.draw() / redraw() / clear()
- _natus_overlay.html: Nominatim place autocomplete (debounced 400ms), geolocation button
  with reverse-geocode city name, live chart preview (debounced 300ms), tz auto-fill,
  NVM / SAVE SKY footer; html.natus-open class toggle pattern
- _natus.scss: Gaussian backdrop+modal, two-column form|wheel layout, suggestion dropdown,
  portrait collapse at 600px, landscape sidebar z-index sink
- room.html: include overlay when table_status == SKY_SELECT

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/epic/models.py

@@ -470,3 +470,141 @@ def active_sig_seat(room):
         if seat.significator_id is None:
             return seat
     return None
+
+
+# ── Astrological reference tables (seeded, never user-edited) ─────────────────
+
+class Sign(models.Model):
+    FIRE  = 'Fire'
+    EARTH = 'Earth'
+    AIR   = 'Air'
+    WATER = 'Water'
+    ELEMENT_CHOICES = [(e, e) for e in (FIRE, EARTH, AIR, WATER)]
+
+    CARDINAL = 'Cardinal'
+    FIXED    = 'Fixed'
+    MUTABLE  = 'Mutable'
+    MODALITY_CHOICES = [(m, m) for m in (CARDINAL, FIXED, MUTABLE)]
+
+    name         = models.CharField(max_length=20, unique=True)
+    symbol       = models.CharField(max_length=5)   # ♈ ♉ … ♓
+    element      = models.CharField(max_length=5,  choices=ELEMENT_CHOICES)
+    modality     = models.CharField(max_length=8,  choices=MODALITY_CHOICES)
+    order        = models.PositiveSmallIntegerField(unique=True)  # 0–11, Aries first
+    start_degree = models.FloatField()                            # 0, 30, 60 … 330
+
+    class Meta:
+        ordering = ['order']
+
+    def __str__(self):
+        return self.name
+
+
+class Planet(models.Model):
+    name   = models.CharField(max_length=20, unique=True)
+    symbol = models.CharField(max_length=5)   # ☉ ☽ ☿ ♀ ♂ ♃ ♄ ♅ ♆ ♇
+    order  = models.PositiveSmallIntegerField(unique=True)  # 0–9, Sun first
+
+    class Meta:
+        ordering = ['order']
+
+    def __str__(self):
+        return self.name
+
+
+class AspectType(models.Model):
+    name   = models.CharField(max_length=20, unique=True)
+    symbol = models.CharField(max_length=5)   # ☌ ⚹ □ △ ☍
+    angle  = models.PositiveSmallIntegerField()  # 0, 60, 90, 120, 180
+    orb    = models.FloatField()                 # max allowed orb in degrees
+
+    class Meta:
+        ordering = ['angle']
+
+    def __str__(self):
+        return self.name
+
+
+class HouseLabel(models.Model):
+    """Life-area label for each of the 12 astrological houses (distinctions)."""
+
+    number   = models.PositiveSmallIntegerField(unique=True)  # 1–12
+    name     = models.CharField(max_length=30)
+    keywords = models.CharField(max_length=100, blank=True)
+
+    class Meta:
+        ordering = ['number']
+
+    def __str__(self):
+        return f"{self.number}: {self.name}"
+
+
+# ── Character ─────────────────────────────────────────────────────────────────
+
+class Character(models.Model):
+    """A gamer's player-character for one seat in one game session.
+
+    Lifecycle:
+      - Created (draft) when gamer opens PICK SKY overlay.
+      - confirmed_at set on confirm → locked.
+      - retired_at set on retirement → archived (seat may hold a new Character).
+
+    Active character for a seat: confirmed_at__isnull=False, retired_at__isnull=True.
+    """
+
+    PORPHYRY  = 'O'
+    PLACIDUS  = 'P'
+    KOCH      = 'K'
+    WHOLE     = 'W'
+    HOUSE_SYSTEM_CHOICES = [
+        (PORPHYRY, 'Porphyry'),
+        (PLACIDUS, 'Placidus'),
+        (KOCH,     'Koch'),
+        (WHOLE,    'Whole Sign'),
+    ]
+
+    # ── seat relationship ─────────────────────────────────────────────────
+    seat = models.ForeignKey(
+        TableSeat, on_delete=models.CASCADE, related_name='characters',
+    )
+
+    # ── significator (set at PICK SKY) ────────────────────────────────────
+    significator = models.ForeignKey(
+        TarotCard, null=True, blank=True,
+        on_delete=models.SET_NULL, related_name='character_significators',
+    )
+
+    # ── natus input (what the gamer entered) ─────────────────────────────
+    birth_dt    = models.DateTimeField(null=True, blank=True)   # UTC
+    birth_lat   = models.DecimalField(max_digits=9, decimal_places=6, null=True, blank=True)
+    birth_lon   = models.DecimalField(max_digits=9, decimal_places=6, null=True, blank=True)
+    birth_place = models.CharField(max_length=200, blank=True)  # display string only
+    house_system = models.CharField(
+        max_length=1, choices=HOUSE_SYSTEM_CHOICES, default=PORPHYRY,
+    )
+
+    # ── computed natus snapshot (full PySwiss response) ───────────────────
+    chart_data  = models.JSONField(null=True, blank=True)
+
+    # ── celtic cross spread (added at PICK SEA) ───────────────────────────
+    celtic_cross = models.JSONField(null=True, blank=True)
+
+    # ── lifecycle ─────────────────────────────────────────────────────────
+    created_at   = models.DateTimeField(auto_now_add=True)
+    confirmed_at = models.DateTimeField(null=True, blank=True)
+    retired_at   = models.DateTimeField(null=True, blank=True)
+
+    class Meta:
+        ordering = ['-created_at']
+
+    def __str__(self):
+        status = 'confirmed' if self.confirmed_at else 'draft'
+        return f"Character(seat={self.seat_id}, {status})"
+
+    @property
+    def is_confirmed(self):
+        return self.confirmed_at is not None
+
+    @property
+    def is_active(self):
+        return self.confirmed_at is not None and self.retired_at is None