feat(jobs/challenges): Phase 2 — 7 more poll-based processors

[raymondjacobson]

Summary

Stacked on #835 (Phase 1). Adds 7 more challenge processors. No new infra — all source tables already exist.

ID	Source	Notes
`c` first_weekly_comment	`comments` grouped by ISO week	One row per (user, ISO-year, ISO-week)
`cp` comment_pin	`tracks.pinned_comment_id` + `users.is_verified`	Commenter earns when verified track owner pins their (non-self) comment
`cs` cosign	`remixes` + `reposts`/`saves` + `users.is_verified`	Verified parent owner saves/reposts a remix → remixer earns. Cap: 5 cosigns per parent-owner per rolling 30 days. Currently `active=false` in catalog.
`t` tastemaker	`track_trending_scores` (top-10) + `reposts`/`saves`	Earliest 10 reposters + 10 savers per top-10 trending track. Top-N is 10 per direction (apps had 5).
`w` remix_contest_winner	`events.event_data->>'winners'` JSONB	Verified-host winners earn. Max 5 winners/contest, max 5 host rewards/rolling week.
`b` audio_matching_buyer	`v_usdc_purchases` (incremental on slot)	`amount = 1 × dollars` (dollars = micro-USDC / 1e6)
`s` audio_matching_seller	same	`amount = 5 × dollars`, gated on seller `is_verified`

Confirmations folded in

• `cs` cap: 5 cosigns / 30 days ✓
• `t` top-N: 10 (was 5 in apps) ✓
• `w`: read winners directly from `events.event_data->>'winners'` JSONB ✓
• `b`/`s` amount: catalog × dollars (b=1×, s=5×) ✓

Stack

```
#834 parity jobs
└─ #835 phase 1 challenges
└─ this PR — phase 2 challenges
```

Test plan

11 DB-backed tests in addition to the 12 from Phase 1:

• `TestFirstWeeklyComment_OneRowPerUserPerWeek` — dedupe within week, separate weeks → separate rows
• `TestCommentPin_VerifiedOwnerPinsOthersComment` — happy path
• `TestCommentPin_SkippedWhenOwnerNotVerified` — gate enforced
• `TestCommentPin_SkippedForSelfPin` — gate enforced
• `TestCosign_VerifiedParentReposting` — happy path (activates the inactive catalog row for the test)
• `TestCosign_MonthCap` — 6th cosign within 30d blocked
• `TestTastemaker_EarliestRepostersAndSavers` — both action types earn
• `TestRemixContestWinner_VerifiedHostMintsRows` — two winners → two rows
• `TestRemixContestWinner_UnverifiedHostSkipped` — gate enforced
• `TestAudioMatching_BuyerAndSeller` — both rows minted with correct amounts
• `TestAudioMatching_SellerUnverifiedNoRow` — verified-seller gate
• `TestAudioMatching_InvalidPurchaseExcluded` — `v_usdc_purchases` filters
• All Phase 1 tests still pass (no regressions)
• `go build ./...` clean

Next

PR B (signals endpoint + 5 Phase 3 processors) follows.

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