GC engine (internal/gc/): Collector.Run() implements the two-phase
algorithm — Phase 1 finds unreferenced blobs and deletes DB rows in
a single transaction, Phase 2 deletes blob files from storage.
Registry-wide mutex blocks concurrent GC runs. Collector.Reconcile()
scans filesystem for orphaned files with no DB row (crash recovery).
Wired into admin_gc.go: POST /v1/gc now launches the real collector
in a goroutine with gc_started/gc_completed audit events.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
internal/policy/:
Priority-based policy engine per ARCHITECTURE.md §4. Stateless
Evaluate() sorts rules by priority, collects all matches, deny-wins
over allow, default-deny if no match. Rule matching: all populated
fields ANDed, empty fields are wildcards, repository glob via
path.Match. Built-in defaults: admin wildcard (all actions), human
user content access (pull/push/delete/catalog), version check
(always accessible). Engine wrapper with sync.RWMutex-protected
cache, SetRules merges with defaults, Reload loads from RuleStore.
internal/db/:
LoadEnabledPolicyRules() parses rule_json column from policy_rules
table into []policy.Rule, filtered by enabled=1, ordered by priority.
internal/server/:
RequirePolicy middleware extracts claims from context, repo from chi
URL param, evaluates policy, returns OCI DENIED (403) on deny with
optional audit callback.
69 tests passing across all packages.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Phase 2 — internal/storage/:
Content-addressed blob storage with atomic writes via rename.
BlobWriter stages data in uploads dir with running SHA-256 hash,
commits by verifying digest then renaming to layers/sha256/<prefix>/<hex>.
Reader provides Open, Stat, Delete, Exists with digest validation.
Phase 3 — internal/auth/ + internal/server/:
MCIAS client with Login and ValidateToken, 30s SHA-256-keyed cache
with lazy eviction and injectable clock for testing. TLS 1.3 minimum
with optional custom CA cert.
Chi router with RequireAuth middleware (Bearer token extraction,
WWW-Authenticate header, OCI error format), token endpoint (Basic
auth → bearer exchange via MCIAS), and /v2/ version check handler.
52 tests passing (14 storage + 9 auth + 9 server + 20 existing).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
