docs: update relay lists + add merge plan

- nostr_relays: 2->4 (+relay.anzenkodo.workers.dev, +nostr.koning-degraaf.nl)
- nostr_seed_relays: 4->8 (+relay.anzenkodo.workers.dev, +nostr.koning-degraaf.nl,
  +knostr.neutrine.com, +nostr.einundzwanzig.space)
- Add MERGE_PLAN.md with squash-merge execution checklist

2 files changed, 127 insertions, 4 deletions

diff --git a/AGENTS.md b/AGENTS.md
index 2c16a8a..f46de4d 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -91,13 +91,17 @@ nvs_flash_init()
   "price_per_step": 21,
   "step_size_ms": 60000,
   "nostr_geohash": "u281w0dfz",
-  "nostr_relays": ["wss://relay.damus.io", "wss://nos.lol"],
+  "nostr_relays": ["wss://relay.damus.io", "wss://nos.lol", "wss://relay.anzenkodo.workers.dev", "wss://nostr.koning-degraaf.nl"],
   "nostr_publish_interval_s": 21600,
   "nostr_seed_relays": [
     "wss://relay.orangesync.tech",
     "wss://relay.damus.io",
     "wss://nos.lol",
-    "wss://relay.nostr.band"
+    "wss://relay.nostr.band",
+    "wss://relay.anzenkodo.workers.dev",
+    "wss://nostr.koning-degraaf.nl",
+    "wss://knostr.neutrine.com",
+    "wss://nostr.einundzwanzig.space"
   ],
   "nostr_sync_interval_s": 1800,
   "nostr_fallback_sync_interval_s": 21600,
@@ -214,8 +218,8 @@ make flash-b        # flash to Board B
 ## External Dependencies
 
 - **Test mint:** `testnut.cashu.space` — auto-pays lightning invoices
-- **Nostr relays:** `relay.damus.io`, `nos.lol` — for wifistr events
-- **Seed relays:** `relay.orangesync.tech` (NIP-77), `relay.damus.io`, `nos.lol`, `relay.nostr.band` — for relay selection and sync
+- **Nostr relays:** `relay.damus.io`, `nos.lol`, `relay.anzenkodo.workers.dev`, `nostr.koning-degraaf.nl` — for wifistr events
+- **Seed relays:** `relay.orangesync.tech` (NIP-77), `relay.damus.io`, `nos.lol`, `relay.nostr.band`, `relay.anzenkodo.workers.dev`, `nostr.koning-degraaf.nl`, `knostr.neutrine.com`, `nostr.einundzwanzig.space` — for relay selection and sync
 - **CVM relay:** `relay.primal.net` — for ContextVM kind 25910 events and CEP-6 announcements
 - **Local relay:** Port 4869, LittleFS 4MB partition at 0x500000, max 5000 events, 21-day TTL
 - **Nutshell CLI:** `cashu` command for token generation
diff --git a/MERGE_PLAN.md b/MERGE_PLAN.md
new file mode 100644
index 0000000..ff60e4b
--- /dev/null
+++ b/MERGE_PLAN.md
@@ -0,0 +1,119 @@
+# Mining Feature: Squash-Merge Execution Plan
+
+## Overview
+Squash-merge `feature/mining-payment` into `master`, update relay config, push.
+
+## Repositories
+- **Shared repo:** `/home/c03rad0r/esp32-tollgate` (master)
+- **Mining worktree:** `/home/c03rad0r/esp32-tollgate-mining` (feature/mining-payment)
+- **Backup:** `/home/c03rad0r/mining-work-backup/`
+
+## Checklist
+
+### Phase 1: Documentation & Config Updates
+- [ ] 1.1 Write this MERGE_PLAN.md
+- [ ] 1.2 Update `config.c` — add relays to nostr_seed_relays (8/8) and nostr_relays (4/4)
+- [ ] 1.3 Update `AGENTS.md` — reflect new relay lists in shared repo
+- [ ] 1.4 Commit relay config changes to worktree
+
+### Phase 2: Rebase & Test
+- [ ] 2.1 Rebase `feature/mining-payment` onto `master`
+- [ ] 2.2 Run `make test-unit` — all 15 suites must pass
+
+### Phase 3: Backup
+- [ ] 3.1 Backup branch to `/home/c03rad0r/mining-work-backup/`
+
+### Phase 4: Squash-Merge
+- [ ] 4.1 Squash-merge `feature/mining-payment` into `master` with detailed body
+- [ ] 4.2 Run `make test-unit` on master to confirm
+- [ ] 4.3 Run `idf.py build` on master to confirm clean build
+
+### Phase 5: Push & Cleanup
+- [ ] 5.1 Push master to origin
+- [ ] 5.2 Remove git worktree
+- [ ] 5.3 Update MINING_WORKTREE_PLAN.md checklist
+
+## Relay Updates
+
+### nostr_seed_relays (TOLLGATE_MAX_SEED_RELAYS = 8)
+| Slot | Relay | Latency | Notes |
+|------|-------|---------|-------|
+| 0 | wss://relay.orangesync.tech | existing | NIP-77 |
+| 1 | wss://relay.damus.io | existing | |
+| 2 | wss://nos.lol | existing | |
+| 3 | wss://relay.nostr.band | existing | |
+| 4 | wss://relay.anzenkodo.workers.dev | 90ms | FR, NIP-01 |
+| 5 | wss://nostr.koning-degraaf.nl | 91ms | NL, NIP-01 |
+| 6 | wss://knostr.neutrine.com | 103ms | FR, NIP-01 |
+| 7 | wss://nostr.einundzwanzig.space | 106ms | DE |
+
+### nostr_relays (TOLLGATE_MAX_RELAYS = 4)
+| Slot | Relay | Notes |
+|------|-------|-------|
+| 0 | wss://relay.damus.io | existing |
+| 1 | wss://nos.lol | existing |
+| 2 | wss://relay.anzenkodo.workers.dev | NEW |
+| 3 | wss://nostr.koning-degraaf.nl | NEW |
+
+## Squash Commit Message
+```
+feat(mining): Bitcoin mining-for-bandwidth payment system
+
+New modules:
+- mining_payment.c/h: hashprice calc (nbits->difficulty->sat/GH/s/day),
+  share validation, client stats, allotment conversion (ms + bytes)
+- stratum_client.c/h: SV1 upstream pool connection (subscribe/authorize/submit)
+- stratum_proxy.c/h: Local SV1 TCP server for downstream miners, job broadcast
+- sw_miner.c/h: Software SHA256d miner (ESP32 CPU fallback)
+- asic_miner.c/h: ASIC detection stub (BM1366/BM1368 SPI)
+
+Config:
+- config.h/c: mining_payout_mode_t enum (auto/pool/upstream/proxy_only),
+  stratum pool settings, mining port, hashprice override, sandbox mint access
+- Defaults fill nostr_seed_relays (8/8) and nostr_relays (4/4) with fast relays
+
+Integration into existing modules:
+- session.h/c: payment_method_t enum (CASHU/MINING/BYTES)
+- firewall.h/c: firewall_set_mining_port(), firewall_set_sandbox_mint_access()
+- tollgate_api.c: GET /mining/job, POST /mining/share, GET /mining/stats
+- tollgate_client.h/c: TG_CLIENT_MINING state, mining discovery tag parsing
+- tollgate_main.c: mining init in start_services(), stratum_client_tick() in loop
+- captive_portal.c: tabbed Cashu/Mine UI with live hashrate polling
+
+Unit tests (69 new assertions across 4 suites):
+- test_mining_payment (23 tests): nbits->difficulty, hashprice, client stats, allotment
+- test_stratum_proxy (21 tests): job set/get, stats, type validation
+- test_session_payment_method (12 tests): PAYMENT_METHOD enum, bytes/cashu methods
+- test_tollgate_client_mining (20 tests): mining tag parsing, discovery struct
+- test_firewall_sandbox (16 tests): client grant/revoke, max clients, setters
+
+Enhanced test stubs:
+- BaseType_t/pdPASS in freertos/task.h
+- lwip: sockets.h, etharp.h, prot/ip.h, prot/ip4.h, prot/tcp.h, netif.h
+- dns_server.h, esp_wifi_ap_get_sta_list.h
+
+Build fixes:
+- cvm_server.c: replace esp_timer_get_time() with xTaskGetTickCount(),
+  fix process_relay_message() 3-arg call to 2-arg
+- stratum_proxy.c: widen task_name buffer 16->20
+- sw_miner.c: add missing #include esp_random.h
+- nucula_src: save_proofs() moved to public in wallet.hpp
+
+Nostr relay updates:
+- nostr_seed_relays: +relay.anzenkodo.workers.dev, +nostr.koning-degraaf.nl,
+  +knostr.neutrine.com, +nostr.einundzwanzig.space (8/8 slots)
+- nostr_relays: +relay.anzenkodo.workers.dev, +nostr.koning-degraaf.nl (4/4 slots)
+
+Binary: 1.2MB, 70% partition free (ESP32-S3, 16MB flash)
+```
+
+## Commits on feature/mining-payment (before squash)
+1. `c75230e` — feat(mining): add new mining source files and unit tests
+2. `beb73a2` — feat(mining): integrate mining subsystem into existing modules
+3. `473b4d1` — fix: build errors in cvm_server, stratum_proxy, sw_miner + nucula visibility
+4. `ef9ae98` — test: add 4 new unit test suites for mining modules
+
+## Rules
+- No comments in code unless explicitly requested
+- Commit + push after each checkpoint
+- Shared repo must stay on master, clean