Wire the config loader, backends, and HTTP server into an executable.
`serve` runs the resolve hop until SIGINT/SIGTERM (graceful shutdown);
`get` resolves one ref to stdout as a bare value with no trailing
newline for $(...) exec-style plumbing. Exit codes: 0 ok, 1 usage or
config error, 2 resolution failure.
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Assisted-by: Crush:glm-5.2
Implement `keyproxy serve`: POST /v1/resolve (constant-time bearer-token
auth, 4 KiB body cap, mpk- ref validation before any echo) and
GET /healthz. The token is resolved once at startup from the file
backend. Panics are recovered with the panic value discarded and detail
suppressed; auth failures log the remote address only; every log line
naming a ref masks it as <ref>=***. Failures respond with fixed reason
enums (404/400/405/413/500/501/502) that cannot embed material.
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Assisted-by: Crush:glm-5.2
Parse keyproxy.toml (listen address, [auth] token_ref, and the mpk-<name>
ref map) using a deliberate TOML subset implemented with the standard
library only. The surface is strict: unknown keys, malformed refs, and
backend-specific misconfigurations (e.g. env refs setting key, file refs
missing key) fail loudly at startup. The bearer-token ref must resolve
through the file backend. Parse errors carry line numbers, never line
contents.
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Assisted-by: Crush:glm-5.2
Introduce the single Backend interface every credential source implements.
v0 ships two working backends: file (0600 KEY=VALUE env files, parsed in
pure Go, never sourced; looser permission masks refused before read) and
env (process-environment indirection). Bitwarden Secrets Manager and
HashiCorp Vault ship as explicit not-implemented stubs behind the same
interface so the phase-3 connectors are drop-ins. All failures are typed
ResolveErrors carrying only the ref, backend, and a fixed reason enum —
never material.
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Assisted-by: Crush:glm-5.2
Purpose kept; adds dated status line, scope/non-goals (no admin UI,
memory-only), today-vs-planned table, and navigable links into the
ukrrs/MOPAC design docs.
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Assisted-by: Crush:glm-5.2
mrcharles