feat: add tollgate_core component + market config wiring

- Add tollgate_core ESP-IDF component (skeleton: cashu, dns, firewall, session)
- Add tollgate_platform.c with SPIFFS config backend
- Wire market_enabled, market_scan_interval_s, client_auto_switch in config.c
- Add lwip_tollgate_hooks.h (updated from feature branch)
- Add E2E fix plan, tollgate_core design doc, WPA autodetect plan
- Add integration test network helpers
- Add CONSOLIDATION.md plan

Reverts the broken merge (be4788b) that gutted config.c/tollgate_main.c/tollgate_api.c
and replaces it with a clean addition on top of intact master.

1 files changed, 158 insertions, 0 deletions

diff --git a/CONSOLIDATION.md b/CONSOLIDATION.md
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+# Consolidation Plan
+
+Merge all feature branches into master, establish tollgate_core as the single source of truth,
+and clean up worktrees/stashes/stale branches.
+
+## End State
+
+```
+esp32-tollgate (master only)
+  main/ = thin shell calling tollgate_core API
+  components/tollgate_core/ = THE reusable core (cashu, dns, firewall, session, mining, stratum)
+
+esp-miner-nerdqaxeplus (develop)
+  references tollgate_core via IDF Component Manager (override_path for local dev)
+
+esp-miner (master)
+  references tollgate_core via IDF Component Manager (after its feature/tollgate-component-integration)
+```
+
+---
+
+## Phase 1: Preserve Uncommitted Work
+
+- [ ] **1.1** Apply stash@{1} to master (AP-only services, market config wiring, sta_connecting guard)
+- [ ] **1.2** Commit: "feat: AP-only services startup + market config wiring (from stash)"
+- [ ] **1.3** Drop stashes 0, 2, 3 (compiled binaries only, no source)
+- [ ] **1.4** Verify master builds: `idf.py build`
+- [ ] **1.5** Verify unit tests pass: `make test-unit`
+- [ ] **1.6** Commit + push
+
+## Phase 2: Merge feature/display-fix (touch + WiFi setup UI)
+
+- [ ] **2.1** Verify feature/display-fix has no uncommitted source changes (only binaries — confirmed)
+- [ ] **2.2** Squash-merge feature/display-fix into master
+- [ ] **2.3** Resolve any conflicts (display.c/font.c may conflict with master versions)
+- [ ] **2.4** Verify build: `idf.py build`
+- [ ] **2.5** Verify unit tests: `make test-unit` (should pick up test_touch, test_keyboard, test_wifi_setup)
+- [ ] **2.6** Commit + push
+
+## Phase 3: Merge feature/miner-integration (full tollgate_core)
+
+This is the critical merge. Master has the OLD tollgate_core skeleton (9 files, 7 callbacks).
+feature/miner-integration has the FULL version (13 files, 22 callbacks, extern C, mining + stratum).
+We need to take the miner-integration version of tollgate_core entirely.
+
+- [ ] **3.1** Verify feature/miner-integration has no uncommitted source changes (only binaries — confirmed)
+- [ ] **3.2** Checkout feature/miner-integration version of tollgate_core into master:
+  - Replace `components/tollgate_core/` entirely with the miner-integration version
+  - This adds: tollgate_core_mining.c/h, tollgate_core_stratum_proxy.c/h
+  - This updates: tollgate_core.h (extern C + 5 new mining API functions)
+  - This updates: tollgate_platform.h (extern C + 14 new platform callbacks for mining/stratum)
+  - This updates: tollgate_core_firewall.c (conditional NAPT)
+  - This updates: CMakeLists.txt (mining + stratum source files)
+- [ ] **3.3** Commit: "feat: upgrade tollgate_core to full version with mining + stratum + extern C"
+- [ ] **3.4** Merge remaining docs from feature/miner-integration (REMOTES.md, MINER_INTEGRATION_PLAN.md)
+- [ ] **3.5** Verify build: `idf.py build`
+- [ ] **3.6** Verify unit tests: `make test-unit`
+- [ ] **3.7** Commit + push
+
+## Phase 4: Restructure — Option B (main/ calls tollgate_core API)
+
+Move module logic from main/ into components/tollgate_core/, making main/ a thin shell.
+
+- [ ] **4.1** Identify modules in main/ that have tollgate_core equivalents:
+  - cashu.c/h → tollgate_core_cashu.c/h
+  - dns_server.c/h → tollgate_core_dns.c/h
+  - firewall.c/h → tollgate_core_firewall.c/h
+  - session.c/h → tollgate_core_session.c/h
+  - mining_payment.c/h → tollgate_core_mining.c/h
+  - stratum_proxy.c/h → tollgate_core_stratum_proxy.c/h
+- [ ] **4.2** For each module: replace main/*.c implementation with calls to tollgate_core API
+  - Keep the main/*.c files as thin wrappers that delegate to tollgate_core
+  - OR remove them entirely if tollgate_core API is called directly from tollgate_main.c
+- [ ] **4.3** Update main/CMakeLists.txt — remove replaced source files from SRCS
+- [ ] **4.4** Verify build: `idf.py build`
+- [ ] **4.5** Verify unit tests: `make test-unit`
+- [ ] **4.6** Run integration tests if hardware available: `make test-integration`
+- [ ] **4.7** Commit: "refactor: main/ delegates to tollgate_core component"
+- [ ] **4.8** Push
+
+## Phase 5: Wire up NerdQAxePlus via Component Manager
+
+- [ ] **5.1** Create main/idf_component.yml in NerdQAxePlus:
+  ```yaml
+  dependencies:
+    tollgate_core:
+      override_path: /home/c03rad0r/esp32-tollgate/components/tollgate_core
+  ```
+- [ ] **5.2** Remove symlink: rm esp-miner-nerdqaxeplus/components/tollgate_core
+- [ ] **5.3** Update main/CMakeLists.txt — remove hardcoded include path, use component dependency
+- [ ] **5.4** Verify build: `BOARD=NERDAXE TOLLGATE=1 idf.py build`
+- [ ] **5.5** Commit + push
+
+## Phase 6: Delete Branches & Worktrees
+
+- [ ] **6.1** Delete feature/tollgate-core-component branch (merged in commit be4788b)
+- [ ] **6.2** Delete backup/multi-mint-support-pre-rebase branch (fully in master)
+- [ ] **6.3** Delete feature/display-fix branch (merged in Phase 2)
+- [ ] **6.4** Delete feature/miner-integration branch (merged in Phase 3)
+- [ ] **6.5** Remove worktree: esp32-miner-integration/
+- [ ] **6.6** Remove worktree: esp32-tollgate-arch/
+- [ ] **6.7** Remove worktree: esp32-tollgate-display/
+- [ ] **6.8** Clean up test binaries from git tracking: `git rm --cached tests/unit/test_*` (keep in .gitignore)
+- [ ] **6.9** Refresh backup bundles
+- [ ] **6.10** Push everything
+
+## Phase 7: Update esp-miner (optional, after consolidation)
+
+- [ ] **7.1** Switch esp-miner from flat-file modules to tollgate_core via Component Manager
+- [ ] **7.2** Create main/idf_component.yml with git dependency on esp32-tollgate
+- [ ] **7.3** Delete flat-file TollGate modules from main/ (tollgate_cashu/dns/firewall/session.c/h)
+- [ ] **7.4** Create main/tollgate_platform.c implementing tollgate_platform_t with NVS backend
+- [ ] **7.5** Verify build
+- [ ] **7.6** Commit + push
+
+---
+
+## Current State Summary
+
+### Repos
+
+| Repo | Path | Branch | HEAD | Status |
+|------|------|--------|------|--------|
+| esp32-tollgate | /home/c03rad0r/esp32-tollgate | master | 897a8d9 | Canonical source |
+| esp-miner-nerdqaxeplus | /home/c03rad0r/esp-miner-nerdqaxeplus | develop | 588c9f67 | Consumer |
+| esp-miner | /home/c03rad0r/esp-miner | master | a8dc494 | Consumer (Phase 1 done) |
+
+### Branches (esp32-tollgate)
+
+| Branch | Worktree | Merged? | Unique Content | Action |
+|--------|----------|---------|----------------|--------|
+| master | esp32-tollgate | — | Current production code | Keep |
+| feature/display-fix | esp32-tollgate-display | NO | touch.c/h, keyboard.c/h, wifi_setup.c/h, 4 unit tests, E2E test, WiFi QR, error state | Merge (Phase 2) |
+| feature/miner-integration | esp32-miner-integration | PARTIAL | Full tollgate_core (mining+stratum+extern C+22 callbacks), docs | Merge (Phase 3) |
+| feature/tollgate-core-component | esp32-tollgate-arch | YES (be4788b) | None — superseded by miner-integration | Delete (Phase 6) |
+| backup/multi-mint-support-pre-rebase | (none) | YES | None | Delete (Phase 6) |
+
+### Stashes (esp32-tollgate)
+
+| Stash | Content | Action |
+|-------|---------|--------|
+| stash@{0} | Recompiled test binaries (no source changes) | Drop |
+| stash@{1} | AP-only services, market config wiring, sta_connecting guard | Apply (Phase 1) |
+| stash@{2} | Recompiled test binaries (no source changes) | Drop |
+| stash@{3} | Recompiled test binaries (no source changes) | Drop |
+
+### Tollgate Core Divergence
+
+| File | Master (old skeleton) | Miner-integration (full) |
+|------|----------------------|--------------------------|
+| tollgate_core.h | 34 lines, no extern C, no mining API | 48 lines, extern C, 5 mining functions |
+| tollgate_platform.h | 17 lines, 7 callbacks | 37 lines, extern C, 22 callbacks |
+| CMakeLists.txt | 9 source files (no mining/stratum) | 11 source files (mining+stratum) |
+| tollgate_core_firewall.c | unconditional NAPT | conditional CONFIG_LWIP_IPV4_NAPT |
+| tollgate_core_mining.c | MISSING | Present (168 lines) |
+| tollgate_core_mining.h | MISSING | Present (35 lines) |
+| tollgate_core_stratum_proxy.c | MISSING | Present (160 lines) |
+| tollgate_core_stratum_proxy.h | MISSING | Present (39 lines) |