Achievements on arcade via tak.arcade (RFC 0014)

[dmccoystephenson]

Overwinter is given nine achievements on arcade, reported through tak.arcade.unlock (tak PR #21, Stephenson-Software RFC 0014). Since knowledge is the progression here, the achievements follow facts and endings:

id	title	description	hidden	unlocked when
counted	Counted	Count the station's store for yourself	no	THE_STORE learned
signed-for	Signed For	Find out what was landed in September	no	THE_MANIFEST learned
old-stores	Old Stores	Find what an earlier winter left behind	no	THE_DEPOT learned
the-answer	The Answer to the Count	Find out where the missing food went	no	THE_FIFTH learned
the-whole-winter	The Whole Winter	Learn everything the station can tell you	no	every non-ending fact known
remembered	They Will Remember That	Make a choice someone will hold you to	no	Scene.remember
twentieth-morning	The Twentieth Morning	See the winter through to the plane	no	FIVE_OUT (ending)
in-the-dark	In the Dark	End the winter before the plane was due	no	THE_DARK_FLIGHT (ending)
his-choice	His Choice	Let Aksel stay on the island	yes	AKSEL_STAYED (ending)

How it works:

• src/overwinter/achievements.py holds the declarations and the hooks. Game.learn reports a fact only when it is newly learned (endings are facts, learned at the moment the winter ends), and Scene.remember reports the remembered choice.
• A loaded save is credited once, after load, with what it already implies (achievements.catchUp), so a winter played before this change still counts. It only reads the state.
• Nothing is written to the save and the schema is unchanged. Every call goes through one helper that swallows exceptions; tak.arcade is itself a no-op off arcade, signed out, and in tests.
• tak is pinned at 963cd3c (adds tak.arcade; the only change since the previous pin).
• The ids are declared for overwinter in the gateway's config/play/boards.yaml separately; that snippet was checked with arcade-social's own boards.load.

Verification:

• tests/test_achievements.py (10 tests) runs the existing scripted routes with tak.arcade.unlock mocked: five on the plane with everything known, Aksel staying, and the dark flight each report the expected ids, and together they cover every declared id. A new game reports nothing; loading a save reports what it earned and leaves the save unchanged. Full suite: 55 passed.
• In Chromium (Playwright), the built bundle was served as https://overwinter.play.danielstephenson.dev with arcade-social mocked. A day-19 save written by origin/main code loaded from IndexedDB ("Load Slot 1 (Day 19, 14 known)"). Playing on to the plane posted counted, signed-for, old-stores, the-answer, remembered, remembered, twentieth-morning to /v1/achievements/<id>, with X-Play-Client: 1 and the game origin. With /v1/session answering 401, no unlock POST was made. There were no page errors in either run.

drafted by Claude on behalf of Daniel Stephenson

🤖 Generated with Claude Code