Phase 10a v1.2.0: MIT license, metadata update, full API docs

- Bump idf_component.yml to v1.2.0 with MIT license, targets, tags
- Add LICENSE (MIT) for IDF Component Registry compatibility
- Update CHANGELOG.md with v1.2.0 entries (portal, stratum_client, mint_health, client)
- Update README.md with all 13 modules documented, API reference table
- Add REMAINING_PLAN.md with full execution plan and checklist
- 25 unit tests pass, ESP-IDF build passes

4 files changed, 110 insertions, 13 deletions

diff --git a/components/tollgate_core/CHANGELOG.md b/components/tollgate_core/CHANGELOG.md
index b6d664f..946c600 100644
--- a/components/tollgate_core/CHANGELOG.md
+++ b/components/tollgate_core/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## 1.2.0 (2026-05-23)
+
+- Added `tollgate_core_portal` — HTML template rendering, usage calculation, captive URI detection
+- Added `tollgate_core_stratum_client` — Stratum V1 JSON protocol parsing, message building (subscribe, authorize, submit, mining.notify, mining.set_difficulty)
+- Added `tollgate_core_mint_health` — mint health state tracking with recovery threshold (3 consecutive successes), reachable/unreachable transitions
+- Added `tollgate_core_client` — upstream TollGate discovery JSON parsing (kind 10021), session response parsing (kind 1022), usage string parsing, renewal threshold check, price-per-minute calculation
+- Added MIT license for IDF Component Registry compatibility
+- 13 compiled source files, 14 headers, full platform abstraction via `tollgate_platform_t`
+- 25 host unit tests covering all modules
+
 ## 1.1.0 (2026-05-23)
 
 - Added `tollgate_core_beacon` — WiFi vendor IE construction (hash_mint, hash_npub, build_ie)
diff --git a/components/tollgate_core/LICENSE b/components/tollgate_core/LICENSE
new file mode 100644
index 0000000..fc72599
--- /dev/null
+++ b/components/tollgate_core/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024-2026 orangesync.tech
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/components/tollgate_core/README.md b/components/tollgate_core/README.md
index d83d634..57bab4d 100644
--- a/components/tollgate_core/README.md
+++ b/components/tollgate_core/README.md
@@ -4,14 +4,27 @@ ESP-IDF component providing paid WiFi hotspot logic with Cashu e-cash payments.
 
 ## Features
 
-- **Session management** — time-based and bytes-based sessions with auto-expiry
-- **Cashu token processing** — decode Cashu e-cash tokens, calculate allotments, multi-mint support
-- **Per-client firewall** — whitelist-based NAT filtering with sandbox mode
-- **DNS server** — per-client DNS hijack/forward with DoT rejection
-- **Mining payment** — Stratum share tracking, hashprice calculation, difficulty conversion
-- **Stratum proxy** — transparent TCP proxy for mining traffic with job management
-- **Beacon price** — WiFi vendor IE construction for price/mint/geohash advertising
-- **Market scanner** — discover and compare nearby TollGate prices
+### Session & Payment
+- **Session management** (`tollgate_core_session`) — time-based and bytes-based sessions with auto-expiry, extension, and revocation
+- **Cashu token processing** (`tollgate_core_cashu`) — decode Cashu e-cash tokens, calculate allotments, multi-mint support, proof state checking
+- **Per-client firewall** (`tollgate_core_firewall`) — whitelist-based NAT filtering with sandbox mode for unauthenticated clients
+
+### Network
+- **DNS server** (`tollgate_core_dns`) — per-client DNS hijack/forward with DoT rejection
+- **Stratum proxy** (`tollgate_core_stratum_proxy`) — transparent TCP proxy for mining traffic with job management
+
+### Mining
+- **Mining payment** (`tollgate_core_mining`) — Stratum share tracking, hashprice calculation, difficulty conversion, share-to-allotment mapping
+- **Stratum client** (`tollgate_core_stratum_client`) — Stratum V1 JSON protocol parsing (mining.notify, mining.set_difficulty), message construction (subscribe, authorize, submit)
+
+### Discovery & Market
+- **Beacon price** (`tollgate_core_beacon`) — WiFi vendor IE construction for price/mint/geohash advertising
+- **Market scanner** (`tollgate_core_market`) — discover and compare nearby TollGate prices via vendor IEs
+- **Mint health** (`tollgate_core_mint_health`) — mint health state tracking with recovery threshold, reachable/unreachable transitions
+
+### Portal & Client
+- **Portal rendering** (`tollgate_core_portal`) — HTML template rendering with multi-key substitution, usage calculation, captive URI detection
+- **TollGate client** (`tollgate_core_client`) — upstream TollGate discovery JSON parsing, session/usage response parsing, renewal threshold logic, price comparison
 
 ## Integration
 
@@ -26,7 +39,15 @@ static tollgate_platform_t platform = {
     .get_mint_url = my_get_mint_url,
     .get_metric = my_get_metric,
     .get_time_ms = my_get_time_ms,
-    // ... other callbacks
+    .spend_proofs = my_spend_proofs,
+    .get_stratum_url = my_get_stratum_url,
+    .get_stratum_port = my_get_stratum_port,
+    .get_stratum_user = my_get_stratum_user,
+    .get_stratum_pass = my_get_stratum_pass,
+    .get_mining_port = my_get_mining_port,
+    .get_hashprice_sats_per_ghs_day = my_get_hashprice,
+    .on_share_accepted = my_on_share_accepted,
+    .get_hashrate = my_get_hashrate,
 };
 ```
 
@@ -54,9 +75,40 @@ tollgate_core_process_payment(client_ip, cashu_token_string);
 
 Call `tollgate_core_tick()` periodically (e.g., every second) to expire sessions.
 
+### 5. Use sub-modules directly
+
+```c
+#include "tollgate_core_portal.h"
+char *html = tollgate_core_portal_render(template, subs, nsubs);
+
+#include "tollgate_core_stratum_client.h"
+tollgate_core_stratum_build_subscribe(buf, size, req_id);
+
+#include "tollgate_core_mint_health.h"
+tollgate_core_mint_health_update(&state, idx, probe_ok, status, err, time);
+
+#include "tollgate_core_client.h"
+bool renew = tollgate_core_client_should_renew(remaining, allotment, threshold);
+```
+
 ## API Reference
 
-See `include/tollgate_core.h` for the public API and `include/tollgate_platform.h` for platform callbacks.
+| Header | Description |
+|--------|-------------|
+| `tollgate_core.h` | Main API: init, process_payment, tick, status queries |
+| `tollgate_platform.h` | Platform callback struct definition |
+| `tollgate_core_session.h` | Session create/find/extend/revoke |
+| `tollgate_core_cashu.h` | Token decode, checkstate, allotment |
+| `tollgate_core_firewall.h` | Client grant/revoke, sandbox ports |
+| `tollgate_core_dns.h` | DNS start/stop |
+| `tollgate_core_mining.h` | Share tracking, hashprice, difficulty |
+| `tollgate_core_stratum_proxy.h` | Proxy init/stop, job management |
+| `tollgate_core_beacon.h` | IE construction, mint/npub hashing |
+| `tollgate_core_market.h` | Market table, price comparison |
+| `tollgate_core_portal.h` | Template rendering, usage calc, captive URIs |
+| `tollgate_core_stratum_client.h` | Stratum V1 protocol parsing |
+| `tollgate_core_mint_health.h` | Mint health state tracking |
+| `tollgate_core_client.h` | Discovery/session parsing, renewal logic |
 
 ## Dependencies
 
@@ -68,4 +120,4 @@ See `include/tollgate_core.h` for the public API and `include/tollgate_platform.
 
 ## License
 
-Proprietary — see repository for details.
+MIT — see [LICENSE](LICENSE).
diff --git a/components/tollgate_core/idf_component.yml b/components/tollgate_core/idf_component.yml
index cdf2ee3..05337d3 100644
--- a/components/tollgate_core/idf_component.yml
+++ b/components/tollgate_core/idf_component.yml
@@ -1,11 +1,25 @@
-version: "1.1.0"
+version: "1.2.0"
 description: |
   TollGate core component for paid WiFi hotspots with Cashu e-cash payments.
   Provides session management, per-client DNS/firewall, Cashu token processing,
-  mining payment tracking, beacon price advertising, and market scanning.
+  mining payment tracking, beacon price advertising, market scanning,
+  portal template rendering, Stratum protocol parsing, mint health tracking,
+  and upstream TollGate client logic.
   Platform-agnostic via tollgate_platform_t callbacks for easy integration
   with any ESP32 firmware (TollGate, NerdQAxePlus, BitAxe, etc.).
 url: https://git.orangesync.tech/npub12m5exm2uk3xa674cc5r0hlyvccs5xxn7qv83ezuteefv5972nquq4j4szl/esp32-tollgate
+license: "MIT"
+targets:
+  - esp32s3
+tags:
+  - wifi
+  - hotspot
+  - cashu
+  - payment
+  - mining
+  - captive-portal
+  - stratum
+  - nostr
 dependencies:
   idf:
     version: ">=5.3.0"