minor changes

CLAUDE.md

@@ -64,15 +64,23 @@ envd is a **completely independent Go module**. It is never imported by the main
 
 ### Control Plane
 
-**Packages:** `internal/api/`, `internal/dashboard/`, `internal/auth/`, `internal/scheduler/`, `internal/lifecycle/`, `internal/config/`, `internal/db/`
+**Internal packages:** `internal/api/`, `internal/dashboard/`
 
-Startup (`cmd/control-plane/main.go`) wires: config (env vars) → pgxpool → `db.Queries` (sqlc-generated) → Connect RPC client to host agent → `api.Server`. Everything flows through constructor injection.
+**Public packages (importable by cloud repo):** `pkg/config/`, `pkg/db/`, `pkg/auth/`, `pkg/auth/oauth/`, `pkg/scheduler/`, `pkg/lifecycle/`, `pkg/channels/`, `pkg/audit/`, `pkg/service/`, `pkg/events/`, `pkg/id/`, `pkg/validate/`
 
-- **API Server** (`internal/api/server.go`): chi router with middleware. Creates handler structs (`sandboxHandler`, `execHandler`, `filesHandler`, etc.) injected with `db.Queries` and the host agent Connect RPC client. Routes under `/v1/capsules/*`.
+**Extension framework:** `pkg/cpextension/` (shared `Extension` interface + `ServerContext`), `pkg/cpserver/` (exported `Run()` entrypoint with functional options for cloud `main.go`)
+
+The cloud repo imports this module as a Go dependency and calls `cpserver.Run(cpserver.WithExtensions(myExt))`. Each extension implements two methods: `RegisterRoutes(r chi.Router, sctx ServerContext)` to add HTTP routes, and `BackgroundWorkers(sctx ServerContext) []func(context.Context)` to add long-running goroutines. `ServerContext` carries all OSS services (DB, scheduler, auth, etc.) so extensions can use them without reimplementing anything. To expose a new OSS service to extensions, add it to `ServerContext` in `pkg/cpextension/extension.go` and populate it in `pkg/cpserver/run.go`.
+
+**pkg/ vs internal/ decision rule:** A package belongs in `pkg/` only if the cloud repo needs to import it directly. Everything else stays in `internal/`. New OSS services (e.g. email, notifications) go in `internal/` — the cloud repo accesses them through `ServerContext`, not by importing the package. Do not put a service in `pkg/` just because the cloud repo uses it.
+
+Startup (`cmd/control-plane/main.go`) is a thin wrapper: `cpserver.Run(cpserver.WithVersion(...))`. All 20 initialization steps live in `pkg/cpserver/run.go`: config → pgxpool → `db.Queries` → Redis → mTLS CA → host client pool → scheduler → OAuth → channels → audit logger → `api.New()` → background workers → HTTP server. Everything flows through constructor injection.
+
+- **API Server** (`internal/api/server.go`): chi router with middleware. Creates handler structs (`sandboxHandler`, `execHandler`, `filesHandler`, etc.) injected with `db.Queries` and the host agent Connect RPC client. Routes under `/v1/capsules/*`. Accepts `[]cpextension.Extension` — each extension's `RegisterRoutes()` is called after all core routes are registered.
 - **Reconciler** (`internal/api/reconciler.go`): background goroutine (every 30s) that compares DB records against `agent.ListSandboxes()` RPC. Marks orphaned DB entries as "stopped".
 - **Dashboard** (SvelteKit + Tailwind + Bits UI, statically built and embedded via `go:embed`, served as catch-all at root)
-- **Database**: PostgreSQL via pgx/v5. Queries generated by sqlc from `db/queries/sandboxes.sql`. Migrations in `db/migrations/` (goose, plain SQL).
-- **Config** (`internal/config/config.go`): purely environment variables (`DATABASE_URL`, `CP_LISTEN_ADDR`, `CP_HOST_AGENT_ADDR`), no YAML/file config.
+- **Database**: PostgreSQL via pgx/v5. Queries generated by sqlc from `db/queries/*.sql` → `pkg/db/`. Migrations in `db/migrations/` (goose, plain SQL). `db/migrations/embed.go` exposes `migrations.FS` so the cloud repo can run OSS migrations via `go:embed`.
+- **Config** (`pkg/config/config.go`): purely environment variables (`DATABASE_URL`, `CP_LISTEN_ADDR`, `CP_HOST_AGENT_ADDR`), no YAML/file config.
 
 ### Host Agent
 
@@ -189,7 +197,7 @@ To add a new RPC method: edit the `.proto` file → `make proto` → implement t
 
 ### sqlc
 
-Config: `sqlc.yaml` (project root). Reads queries from `db/queries/*.sql`, reads schema from `db/migrations/`, outputs to `internal/db/`.
+Config: `sqlc.yaml` (project root). Reads queries from `db/queries/*.sql`, reads schema from `db/migrations/`, outputs to `pkg/db/`.
 
 To add a new query: add it to the appropriate `.sql` file in `db/queries/` → `make generate` → use the new method on `*db.Queries`.
 
@@ -268,6 +276,10 @@ Four fonts with strict roles — this is the design system's strongest personali
 
 Instrument Serif at scale creates the signature editorial moments. Mono provides the precision signal for technical data. Never swap these roles.
 
+**Tracking overrides (app.css):**
+- `.font-serif` — `letter-spacing: 0.015em` (positive tracking; Instrument Serif reads less condensed at display sizes)
+- `.font-mono` — `font-variant-numeric: tabular-nums` (numbers align in tables and metric displays)
+
 ### Color System
 ```
 Backgrounds: bg-0 (#0a0c0b) through bg-5 (#2a302d) — 6 steps