Phase 8c-8f: Extract portal, stratum_client, mint_health, client into tollgate_core

New component modules:
- tollgate_core_portal.c/h: template rendering, usage calc, captive URI detection
- tollgate_core_stratum_client.c/h: Stratum V1 JSON protocol parsing, message building
- tollgate_core_mint_health.c/h: mint health state tracking, recovery threshold logic
- tollgate_core_client.c/h: discovery/session/usage JSON parsing, renewal check, price calc

Main shims updated to delegate pure logic to component:
- captive_portal.c: uses tollgate_core_portal_render(), format_usage(), is_captive_uri()
- stratum_client.c: uses tollgate_core_stratum_parse_notify/build_*()
- mint_health.c: uses tollgate_core_mint_health_update/is_reachable/mark_unreachable()
- tollgate_client.c: uses tollgate_core_client_parse_*/should_renew/calc_price_per_min()

4 new unit tests (test_portal, test_stratum_client, test_mint_health_core, test_client_core)
All 25 unit tests pass. ESP-IDF build passes (68% partition free).

1 files changed, 19 insertions, 7 deletions

diff --git a/tests/unit/Makefile b/tests/unit/Makefile
index 9347516..591ec0f 100644
--- a/tests/unit/Makefile
+++ b/tests/unit/Makefile
@@ -26,7 +26,7 @@ LDFLAGS := -lmbedcrypto -lcjson -lm
 
 SECP256K1_OBJ := secp256k1.o precomputed_ecmult.o precomputed_ecmult_gen.o
 
-TESTS := test_geohash test_identity test_nostr_event test_cashu test_session test_tollgate_client test_lnurl_pay test_lightning_payout test_mcp_handler test_nip04 test_cvm_server test_beacon_price test_market test_mint_health test_mining_payment test_stratum_proxy test_session_payment_method test_tollgate_client_mining test_firewall_sandbox test_relay_selector test_relay_validator
+TESTS := test_geohash test_identity test_nostr_event test_cashu test_session test_tollgate_client test_lnurl_pay test_lightning_payout test_mcp_handler test_nip04 test_cvm_server test_beacon_price test_market test_mint_health test_mining_payment test_stratum_proxy test_session_payment_method test_tollgate_client_mining test_firewall_sandbox test_relay_selector test_relay_validator test_portal test_stratum_client test_mint_health_core test_client_core
 
 .PHONY: all test clean $(TESTS)
 
@@ -69,8 +69,8 @@ TG_CORE_OBJS_CFLAGS := -include stubs/mint_health.h -include stubs/esp_netif.h -
 test_session: test_session.c $(TG_CORE_SRC)/tollgate_core_cashu.c $(TG_CORE_SRC)/tollgate_core_session.c $(TG_CORE_SRC)/tollgate_core_firewall.c $(TG_CORE_SRC)/tollgate_core.c $(TG_CORE_SRC)/tollgate_core_mining.c $(TG_CORE_SRC)/tollgate_core_dns.c $(TG_CORE_SRC)/tollgate_core_stratum_proxy.c
         $(CC) $(CFLAGS) $(TG_CORE_OBJS_CFLAGS) $^ -o $@ $(LDFLAGS)
 
-test_tollgate_client: test_tollgate_client.c $(REPO_ROOT)/main/market.c $(REPO_ROOT)/main/beacon_price.c $(TG_CORE_SRC)/tollgate_core_beacon.c $(TG_CORE_SRC)/tollgate_core_market.c
-        $(CC) $(CFLAGS) -I $(REPO_ROOT)/main $< $(REPO_ROOT)/main/market.c $(REPO_ROOT)/main/beacon_price.c $(TG_CORE_SRC)/tollgate_core_beacon.c $(TG_CORE_SRC)/tollgate_core_market.c -o $@ $(LDFLAGS)
+test_tollgate_client: test_tollgate_client.c $(REPO_ROOT)/main/market.c $(REPO_ROOT)/main/beacon_price.c $(TG_CORE_SRC)/tollgate_core_beacon.c $(TG_CORE_SRC)/tollgate_core_market.c $(TG_CORE_SRC)/tollgate_core_client.c
+        $(CC) $(CFLAGS) -I $(REPO_ROOT)/main $< $(REPO_ROOT)/main/market.c $(REPO_ROOT)/main/beacon_price.c $(TG_CORE_SRC)/tollgate_core_beacon.c $(TG_CORE_SRC)/tollgate_core_market.c $(TG_CORE_SRC)/tollgate_core_client.c -o $@ $(LDFLAGS)
 
 test_lnurl_pay: test_lnurl_pay.c
         $(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
@@ -87,8 +87,8 @@ test_nip04: test_nip04.c $(REPO_ROOT)/main/nip04.c $(SECP256K1_OBJ)
 test_cvm_server: test_cvm_server.c
         $(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
 
-test_mint_health: test_mint_health.c $(REPO_ROOT)/main/mint_health.c
-        $(CC) -Wall -Wextra -Wno-unused-parameter -Wno-unused-function -Wno-sign-compare -std=gnu17 -g -O0 -DTEST_HOST -include stubs/esp_err.h -I $(REPO_ROOT)/main -I stubs -I $(SECP256K1_INC) -I $(SECP256K1_CFG) -I /usr/include/cjson $< $(REPO_ROOT)/main/mint_health.c -o $@ $(LDFLAGS)
+test_mint_health: test_mint_health.c $(REPO_ROOT)/main/mint_health.c $(TG_CORE_SRC)/tollgate_core_mint_health.c
+        $(CC) -Wall -Wextra -Wno-unused-parameter -Wno-unused-function -Wno-sign-compare -std=gnu17 -g -O0 -DTEST_HOST -include stubs/esp_err.h -I $(REPO_ROOT)/main -I stubs -I $(SECP256K1_INC) -I $(SECP256K1_CFG) -I /usr/include/cjson -I $(TG_CORE_SRC) -I $(TG_CORE_INC) $^ -o $@ $(LDFLAGS)
 
 test_beacon_price: test_beacon_price.c $(REPO_ROOT)/main/beacon_price.c $(TG_CORE_SRC)/tollgate_core_beacon.c
         $(CC) $(CFLAGS) -I $(REPO_ROOT)/main $< $(REPO_ROOT)/main/beacon_price.c $(TG_CORE_SRC)/tollgate_core_beacon.c -o $@ $(LDFLAGS)
@@ -105,8 +105,8 @@ test_stratum_proxy: test_stratum_proxy.c $(REPO_ROOT)/main/stratum_proxy.c $(TG_
 test_session_payment_method: test_session_payment_method.c $(TG_CORE_SRC)/tollgate_core_cashu.c $(TG_CORE_SRC)/tollgate_core_session.c $(TG_CORE_SRC)/tollgate_core_firewall.c $(TG_CORE_SRC)/tollgate_core.c $(TG_CORE_SRC)/tollgate_core_mining.c $(TG_CORE_SRC)/tollgate_core_dns.c $(TG_CORE_SRC)/tollgate_core_stratum_proxy.c
         $(CC) $(CFLAGS) $(TG_CORE_OBJS_CFLAGS) $^ -o $@ $(LDFLAGS)
 
-test_tollgate_client_mining: test_tollgate_client_mining.c
-        $(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
+test_tollgate_client_mining: test_tollgate_client_mining.c $(TG_CORE_SRC)/tollgate_core_client.c
+        $(CC) $(CFLAGS) -I $(REPO_ROOT)/main $< $(TG_CORE_SRC)/tollgate_core_client.c -o $@ $(LDFLAGS)
 
 test_firewall_sandbox: test_firewall_sandbox.c $(TG_CORE_SRC)/tollgate_core_firewall.c $(TG_CORE_SRC)/tollgate_core.c $(TG_CORE_SRC)/tollgate_core_session.c $(TG_CORE_SRC)/tollgate_core_cashu.c $(TG_CORE_SRC)/tollgate_core_mining.c $(TG_CORE_SRC)/tollgate_core_dns.c $(TG_CORE_SRC)/tollgate_core_stratum_proxy.c
         $(CC) $(CFLAGS) -include stubs/dns_server.h $(TG_CORE_OBJS_CFLAGS) $^ -o $@ $(LDFLAGS)
@@ -117,5 +117,17 @@ test_relay_selector: test_relay_selector.c
 test_relay_validator: test_relay_validator.c $(REPO_ROOT)/main/nostr_event.c $(REPO_ROOT)/main/identity.c $(REPO_ROOT)/components/wisp_relay/relay_validator.c $(SECP256K1_OBJ)
         $(CC) $(CFLAGS) -I $(SECP256K1_PRIV_INC) -I $(REPO_ROOT)/main -I $(REPO_ROOT)/components/wisp_relay $< $(REPO_ROOT)/main/nostr_event.c $(REPO_ROOT)/main/identity.c $(REPO_ROOT)/components/wisp_relay/relay_validator.c $(SECP256K1_OBJ) -o $@ $(LDFLAGS)
 
+test_portal: test_portal.c $(TG_CORE_SRC)/tollgate_core_portal.c
+        $(CC) $(CFLAGS) $(TG_CORE_OBJS_CFLAGS) $^ -o $@ $(LDFLAGS)
+
+test_stratum_client: test_stratum_client.c $(TG_CORE_SRC)/tollgate_core_stratum_client.c
+        $(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+
+test_mint_health_core: test_mint_health_core.c $(TG_CORE_SRC)/tollgate_core_mint_health.c
+        $(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+
+test_client_core: test_client_core.c $(TG_CORE_SRC)/tollgate_core_client.c
+        $(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+
 clean:
         rm -f $(TESTS) $(SECP256K1_OBJ)