Feat/jurisdiction presets sdk events revocation export

[reuben148]

Closes #391, Closes #392, Closes #393, Closes #394

Summary

Implements and closes four issues:

#391 — Country allowlist as SDK-configurable jurisdiction preset

• Added named jurisdiction presets in the SDK (presets.ts) — eu, eea, us, non-sanctioned — that expand to ISO 3166-1 numeric code sets.
• Wired into buildVerifyUrl via claimParams.preset, and exposed resolveJurisdictionPreset() for witness inputs.
• JurisdictionPresetError on unknown names; explicit restricted overrides the preset.

#392 — SDK event subscription for claim changes

• Added subscribeClaims({ wallet, claimType?, pollMs?, indexerUrl?, onEvent }) (subscribe.ts), backed by the indexer's /claims API, returning { unsubscribe }.
• Seeds a snapshot, fires added/updated/revoked only on change, creates claims on the fly so consumers are never stale.

#393 — Revocation reason codes

• ProofRegistry.revoke now takes an optional reason code (RevocationReason: 10 expired / 20 superseded / 30 fraud / 40 user_request / 50 other), stored on the record and emitted in the revoke event.
• Indexer persists revoked_reason and exposes revocation_reason_label on /claims; revoke-event parsing aligned to the current layout.
• SDK/client expose getRevocationReason() + REVOCATION_REASONS.

#394 — Holder proof-history export

• Holder page CSV/JSON export of non-sensitive proof history (claim type, verified_at, expiry, tx hash, issuer), built offline from local state (exportProofHistory.ts).

Merge base

Includes merge of latest main (badge #440 + concurrency fix #442) with one resolved conflict in frontend/packages/sdk/src/index.ts.

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[Psalmuel01]

Nice - this genuinely implements all four (jurisdiction presets #391, subscribeClaims #392, revocation reason codes #393, proof-history export #394), and the Closes refs are correct. Three CI failures to fix before merge:

1. Clippy: two assert_eq! with a literal bool in the new proof_registry tests. Use assert!(x) / assert!(!x) instead. Clippy is blocking, so this fails the contract build.

2. Frontend SDK test: the vitest mock of ../../proof-registry/src/index is missing the new REVOCATION_REASONS export. Add it to the vi.mock return so the mock matches the real module.

3. env-check: a new env var this PR reads is not in .env.example (likely the subscription/indexer URL). Run node frontend/scripts/check-env-sync.mjs locally to see which one, and document it.

Fix those three and it should go green. Good, well-scoped work otherwise.