docs(01-01): complete Go project structure and Dockerfile plan

Tasks completed: 2/2
- Initialize Go project with HTTP server
- Create multi-stage Dockerfile

SUMMARY: .planning/phases/01-foundation/01-01-SUMMARY.md

.planning/phases/01-foundation/01-01-SUMMARY.md

@@ -0,0 +1,142 @@
+---
+phase: 01-foundation
+plan: 01
+subsystem: infra
+tags: [go, docker, http, multi-stage-build, health-check]
+
+# Dependency graph
+requires: []
+provides:
+  - Go HTTP server with health check endpoint
+  - Multi-stage Dockerfile for ARM64/x86_64 builds
+  - Project structure following Go conventions
+affects: [01-02-docker-compose, 02-cli-tool, 03-authentication]
+
+# Tech tracking
+tech-stack:
+  added: [golang-1.19, debian-bookworm-slim]
+  patterns: [multi-stage-docker, health-check-endpoint, non-root-container]
+
+key-files:
+  created:
+    - go.mod
+    - cmd/server/main.go
+    - internal/health/handler.go
+    - docker/Dockerfile
+    - .dockerignore
+  modified: []
+
+key-decisions:
+  - "Use Go stdlib only (no external dependencies) for minimal footprint"
+  - "Health check verifies /data volume mount before reporting healthy"
+  - "Multi-stage build with golang:1.25-bookworm and debian:bookworm-slim"
+  - "Non-root user (appuser) in container for security"
+
+patterns-established:
+  - "internal/ for private packages, cmd/ for executables"
+  - "Health endpoint returns JSON with status field"
+  - "Static binary compilation with CGO_ENABLED=0 and -ldflags for cross-platform portability"
+
+# Metrics
+duration: 11min
+completed: 2026-02-03
+---
+
+# Phase 1 Plan 1: Foundation Summary
+
+**Go HTTP server with health check running on port 32768, multi-stage Dockerfile for isolated containerization**
+
+## Performance
+
+- **Duration:** 11 min
+- **Started:** 2026-02-03T08:54:53Z
+- **Completed:** 2026-02-03T09:06:07Z
+- **Tasks:** 2/2
+- **Files modified:** 5
+
+## Accomplishments
+
+- Go module initialized with clean project structure (cmd/, internal/)
+- HTTP server with root endpoint and health check verifying data volume mount
+- Multi-stage Dockerfile optimized for cross-platform builds (x86_64 and ARM64)
+- Static binary compilation with security best practices (non-root user, CGO disabled)
+- All code uses Go stdlib only - no external dependencies
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Initialize Go project with HTTP server** - `2691ded` (feat)
+2. **Task 2: Create multi-stage Dockerfile** - `38edbf6` (feat)
+
+**Plan metadata:** (will be added in final commit)
+
+## Files Created/Modified
+
+- `go.mod` - Go module definition for github.com/acty/pirate-station
+- `cmd/server/main.go` - HTTP server entry point with root and health endpoints
+- `internal/health/handler.go` - Health check handler verifying /data volume mount
+- `docker/Dockerfile` - Multi-stage build with golang:1.25-bookworm → debian:bookworm-slim
+- `.dockerignore` - Excludes .git, planning docs, and build artifacts from Docker context
+
+## Decisions Made
+
+1. **Go stdlib only**: No external dependencies to minimize binary size and maintain simplicity for initial foundation
+2. **Health check design**: Returns 503 when /data not mounted, 200 when healthy - enables container orchestration readiness probes
+3. **Port 32768**: High port chosen to avoid conflicts with other Pi services (per context discussion)
+4. **Debian slim over Alpine**: Better compatibility for debugging, acceptable size tradeoff (~80MB vs ~5MB)
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] Installed Go toolchain**
+
+- **Found during:** Task 1 (Go module initialization)
+- **Issue:** Go not installed on system - `go: command not found` prevented module initialization
+- **Fix:** Installed golang-go from Debian repos (version 1.19.8) using apt-get
+- **Files modified:** System packages only
+- **Verification:** `go version` returns 1.19.8, `go build` succeeds
+- **Committed in:** Task 1 commit (no separate commit needed for system package)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 blocking)
+**Impact on plan:** Go installation was essential to proceed. Version 1.19.8 is older than researched recommendation (1.24+) but adequate for stdlib HTTP server. All code uses syntax compatible with 1.19+.
+
+## Issues Encountered
+
+**Docker image build verification incomplete**
+
+- **Issue:** Corporate proxy (hg-vm-prx-sdc.t.rd.honda.com:8080) blocks Docker Hub access
+- **Impact:** Cannot pull golang:1.25-bookworm or debian:bookworm-slim base images
+- **Evidence:** `proxyconnect tcp: EOF` errors when Docker attempts registry access
+- **Workaround applied:** Verified Go cross-compilation works locally (built amd64 and arm64 binaries successfully at 4.2-4.4MB each)
+- **Docker verification status:**
+  - ✓ Dockerfile syntax correct and follows multi-stage pattern
+  - ✓ Go binary compiles for target platforms
+  - ✗ Cannot verify actual image build until proxy/network resolved
+  - ✗ Cannot verify image size (<150MB target) until build succeeds
+  - ✗ Cannot test container startup or health check endpoint
+- **Next step:** Image build will be verified in 01-02 plan (Docker Compose dev environment) once network access is available, or can build directly on Pi where proxy may not apply
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+**Ready for 01-02 (Docker Compose dev environment)** with one caveat:
+
+- **Blocker:** Docker Hub registry access needed to pull base images
+- **Alternatives:**
+  1. Configure Docker to use corporate proxy correctly
+  2. Build on Raspberry Pi directly (may have different network config)
+  3. Use local registry mirror if available
+  4. Pull images from alternative registry (gcr.io, quay.io)
+
+The foundation code is complete and verified. All Go components compile successfully for both development (x86_64) and production (ARM64) platforms. Container runtime verification deferred to next plan when network access is available.
+
+---
+*Phase: 01-foundation*
+*Completed: 2026-02-03*