fix: merge readiness — display_enabled config, real pubkey, probe interval, dedup services

- Add display_enabled config field (default true, parsed from config.json)
- Guard display_init/display_update behind display_enabled check
- Fix discovery pubkey: replace hardcoded all-zeros with identity_get()->npub_hex
- Revert MINT_HEALTH_PROBE_INTERVAL_S from 30 (testing) to 300 (production)
- Remove duplicate services_start_task call in IP event handler
- Fix UTF-8 arrow in STA auth threshold log message
- Gitignore compiled test binaries (test_mcp_handler, test_mint_health, etc.)
- Remove tracked test binaries from git

Verified on Board B (stable):
- make test-discovery-b: pubkey=d6bfe100..., metric=milliseconds, price_per_step tags
- make test-mints-b: 4 mints listed with reachable field
- Wallet: 40 sats balance with 4 proofs from previous payment
- All API endpoints responding (discovery, mints, wallet, whoami, portal)
- 75/75 unit tests passing

7 files changed, 0 insertions, 0 deletions

diff --git a/tests/unit/test_cvm_server b/tests/unit/test_cvm_server
deleted file mode 100755
index 8f0b605..0000000
--- a/tests/unit/test_cvm_server
+++ /dev/null
diff --git a/tests/unit/test_lightning_payout b/tests/unit/test_lightning_payout
deleted file mode 100755
index c6aaa5f..0000000
--- a/tests/unit/test_lightning_payout
+++ /dev/null
diff --git a/tests/unit/test_lnurl_pay b/tests/unit/test_lnurl_pay
deleted file mode 100755
index 61c9743..0000000
--- a/tests/unit/test_lnurl_pay
+++ /dev/null
diff --git a/tests/unit/test_mcp_handler b/tests/unit/test_mcp_handler
deleted file mode 100755
index a001641..0000000
--- a/tests/unit/test_mcp_handler
+++ /dev/null
diff --git a/tests/unit/test_mint_health b/tests/unit/test_mint_health
deleted file mode 100755
index 2a48ad2..0000000
--- a/tests/unit/test_mint_health
+++ /dev/null
diff --git a/tests/unit/test_nip04 b/tests/unit/test_nip04
deleted file mode 100755
index cbf4c80..0000000
--- a/tests/unit/test_nip04
+++ /dev/null
diff --git a/tests/unit/test_tollgate_client b/tests/unit/test_tollgate_client
deleted file mode 100755
index 8077223..0000000
--- a/tests/unit/test_tollgate_client
+++ /dev/null