Give the interpreter real Celtic Cross meanings and --format/--lang support

- guidance.c now prints last, after the full spread; both it and main.c's
  new Celtic Cross readout pull real Waite card meanings via tarot_data.c
  instead of just naming cards.
- interpreter-cli gains --format text|html|json and --lang en|de, matching
  deck-engine - required linking engine/src/tarot_data.c and i18n.c into
  the interpreter binary (a narrow, documented exception to its earlier
  "no engine .c files" policy) and writing German translations for
  narrative.c's/guidance.c's own text.

docs/reading.md

@@ -18,6 +18,12 @@ exactly where the planets were, and which zodiac sign was rising, at the
 moment you were born — your **natal chart**. Everything else the app
 does is compared against that one fixed reference point.
 
+You can also choose a **language** for your reading - English or German.
+Every part of the reading described below, including the guidance
+paragraph at the end, is available in either; switching languages
+doesn't change any of the astrology or the tarot draw itself, only how
+it's worded.
+
 ## What happens every day
 
 Each day, the app does two independent things and then combines them:
@@ -95,21 +101,51 @@ That wording is condensed from a public-domain 1920 astrology book
 (Sepharial's *Transits and Planetary Periods*), the same way the tarot
 card meanings are condensed from Waite's 1911 book.
 
+Every day — Quiet or Major — the app also reads out your full 10-card
+Celtic Cross spread, position by position, each with that card's actual
+meaning (drawn from the same Waite text as the rest of the reading), so
+you get one complete, readable account of the spread rather than just
+a list of card names.
+
+After that spread, you get a short paragraph of actual guidance: how to
+meet the day, given both the single biggest transit happening and your
+own tarot spread. It looks at that transit's character (is it an easy
+angle or a tense one?) together with your *Attitude* card — the
+position Waite describes as "his position or attitude in the
+circumstances", i.e. how you're currently approaching things — upright
+or reversed, and gives a concrete stance to take today. It then names
+your *Attitude* and *Outcome* cards again, this time spelling out what
+each one actually means for the orientation it landed in — so instead
+of just "your Outcome card is the Wheel of Fortune, reversed" you get
+that card's real meaning alongside it. This is the one place the app
+actually combines the astrology and the tarot into a single piece of
+advice, rather than leaving you to read them side by side yourself, and
+it's printed last, as the closing takeaway once you've seen the full
+spread it's referring to.
+
+The wording flexes with how big the day is: on a Major day it opens
+with something like "With Pluto as today's dominant influence"; on a
+quieter day with only a mild aspect in play it's softer, e.g. "With a
+mild touch from Jupiter today" or, fainter still, "Mercury is only
+faintly active today, but for what it's worth"; and on a genuinely
+uneventful day with no aspects at all, there's no planet to name, so it
+falls back to a plain read of your Attitude card's orientation alone
+("There's no standout transit today - it's an astrologically quiet
+day..."). The underlying stance advice itself doesn't change with
+intensity — only how insistently it's introduced.
+
 ## What a day's reading actually gives you
 
 Put together, one day's reading contains: your natal chart (for
 reference), today's sky and how it's speaking to your chart, how
 significant today is overall (with a plain-language note on each of the
-main events driving that), and your 10-card Celtic Cross spread for the
-day. Right now these sit side by side — the astrology tells you *how
-eventful* today is and *where* to pay attention, and the tarot spread
-gives you the actual guidance to sit with. They don't yet get woven
-into a single narrative (e.g. a spread explained *in light of* today's
-significant transit) — that combined storytelling is the next piece to
-build, not something you get today.
-
-*(This page, like that piece, is still a work in progress — expect it
-to grow as the reading itself does.)*
+main events driving that), your full 10-card Celtic Cross spread read
+out card by card with each card's meaning, and — every day, not just
+Major ones — a closing paragraph of guidance tying the day's biggest
+transit to your Attitude and Outcome cards specifically. Attitude and
+Outcome get that treatment in the closing guidance; the other eight
+positions are read in light of your natal chart and today's sky, the
+way the worked example below does by hand.
 
 ## A worked example
 
@@ -123,7 +159,7 @@ Sagittarius.
 are forming aspects back to the natal chart above — see below for which
 ones actually matter.
 
-**How big is today.**
+**How big is today, and the significant transits.**
 
 ```
 Day significance: Major (4/4)
@@ -149,18 +185,93 @@ from the 5th house, and a disruptive-but-possibly-lucky Uranus trine
 from the 7th. Communication, romance, and relationships are all
 quietly under pressure at once.
 
-**Tarot spread (excerpt).** Drawn independently, using today's date:
+**The Celtic Cross, read out in full** (drawn independently, using
+today's date):
 
-- *The Present* — The Emperor, reversed: immaturity or a loss of
-  authority, rather than confident structure.
-- *The Challenge* — The Devil: force, ravage, an obstacle that isn't
-  easily reasoned with.
-- *The Near Future* — The World, reversed: stagnation, things staying
-  fixed in place rather than resolving.
+```
+Celtic Cross:
+  1. The Present: The Emperor (Reversed)
+     This covers him: the general influence affecting the matter.
+     Benevolence, compassion, credit; also confusion to enemies, obstruction, immaturity.
+  2. The Challenge: The Devil
+     This crosses him: the nature of the obstacle in the matter.
+     Ravage, violence, vehemence, extraordinary efforts, force, fatality.
+  3. The Crown: The Empress
+     This crowns him: the aim or ideal, the best that can be achieved.
+     Fruitfulness, action, initiative, length of days; also difficulty, doubt, ignorance.
+  4. The Foundation: Justice
+     This is beneath him: the basis of the matter, already actual.
+     Equity, rightness, probity, executive; triumph of the deserving side in law.
+  5. The Recent Past: Temperance
+     This is behind him: the influence that is just passing away.
+     Economy, moderation, frugality, management, accommodation.
+  6. The Near Future: The World (Reversed)
+     This is before him: the influence now coming into action.
+     Inertia, fixity, stagnation, permanence.
+  7. Himself: The Magician
+     His position or attitude in the circumstances.
+     Skill, diplomacy, address, subtlety; self-confidence, will.
+  8. His House: The Hermit (Reversed)
+     His environment and the tendencies at work therein.
+     Concealment, disguise, policy, fear, unreasoned caution.
+  9. Hopes and Fears: The Moon (Reversed)
+     His hopes or fears in the matter.
+     Instability, inconstancy, silence, lesser degrees of deception and error.
+  10. The Outcome: Strength
+     What will come: the final result of the matter.
+     Power, energy, action, courage, magnanimity; complete success and honours.
+```
+
+**The closing guidance**, tying the day's biggest transit (Pluto,
+above) to the Attitude and Outcome cards from the spread just shown:
+
+```
+With Pluto as today's dominant influence: Today concentrates whatever you already
+bring to it - your current approach will be amplified, so make sure it's the one
+you want.
+Your Attitude card is The Magician: Skill, diplomacy, address, subtlety; self-confidence, will.
+The spread's likely Outcome is Strength: Power, energy, action, courage, magnanimity; complete success and honours.
+```
 
 Read side by side, the astrology and the tarot happen to rhyme here —
 both point toward something that wants to shift (Pluto's "hidden
 transformation," The Devil's "force") running into something that
-feels stuck (a reversed World, an afflicted Moon) — but that's the
-reader's own synthesis for now, not something the app does for you (see
-above).
+feels stuck (a reversed World, an afflicted Moon). The closing guidance
+picks up part of that thread automatically — an upright Attitude card
+(The Magician) paired with this neutral, concentrating Pluto transit
+becomes "make sure your current approach is the one you want" — reading
+every other position (Challenge, Near Future, and the rest) into that
+same story the way this paragraph just did by hand is the reader's own
+synthesis (see above).
+
+**A quieter day, for contrast.** Someone else — born 10 October 1990 in
+Sydney, checking their reading on 15 January 2026 — gets a much lower-key
+version of the same guidance, because the biggest thing happening that
+day is a loose, single Jupiter aspect rather than an exact Pluto hit:
+
+```
+Day significance: Notable (2/4)
+...
+With a mild touch from Jupiter today: Your instincts are sound, but the day is
+testing them - hold your position without forcing the issue.
+Your Attitude card is The Sun: Material happiness, fortunate marriage, contentment.
+The spread's likely Outcome is Justice: Equity, rightness, probity, executive; triumph of the deserving side in law.
+```
+
+Same stance logic (a tense aspect, an upright Attitude card), but the
+opening line matches how much the day actually asks of you.
+
+**The same Major day, in German.** Switching languages doesn't change
+anything about the reading itself - same cards, same transits, same
+guidance logic - only the words:
+
+```
+Bedeutung des Tages: Einschneidend (4/4)
+(ein einschneidender Transit heute - ein genauerer Blick auf das Keltische Kreuz lohnt sich)
+
+Pluto ist heute der bestimmende Einfluss: Der heutige Tag verstärkt, was du bereits
+mitbringst - deine derzeitige Herangehensweise wird verstärkt, also stelle sicher,
+dass es die richtige ist.
+Deine Haltungskarte ist Der Magier: Geschick, Diplomatie, Gewandtheit, Feinsinn; Selbstvertrauen, Wille.
+Das wahrscheinliche Ergebnis des Blatts ist Kraft: Macht, Energie, Tatkraft, Mut, Großmut; voller Erfolg und Ehren.
+```