chore(cleanup,docs): vite proxy + dead scheduler setter wired + registerAgent/CLI docs (C-1 master)

Closes six 2026-04-24 audit findings (3 P2 + 3 P3) — a cleanup-and-doc
tail bundle that drains the smallest remaining leaves of the audit:

  - cat-u-vite_dev_proxy_plaintext_drift (P2): web/vite.config.ts
    proxied dev requests to http://localhost:8443 against an HTTPS-only
    backend (HTTPS-only since v2.0.47). Every dev-server API call 502'd.
    Fix: targets are now object-form `{target: 'https://...', secure: false,
    changeOrigin: true}` — the dev cert is self-signed by the
    deploy/test bootstrap and changes per-checkout.

  - cat-g-7e38f9708e20 (P3): Scheduler.SetShortLivedExpiryCheckInterval
    was defined + tested but never called from cmd/server/main.go.
    Operators tuning CERTCTL_SHORT_LIVED_EXPIRY_CHECK_INTERVAL got
    no effect — the 30s default in scheduler.NewScheduler was
    effectively hardcoded. Fix: added Config.Scheduler.ShortLivedExpiryCheckInterval
    + getEnvDuration in Load() reading the env var with a 30s default,
    + sched.SetShortLivedExpiryCheckInterval(...) call in main.go
    alongside the other scheduler-interval setters.

  - diff-10xmain-2bf4a0a60388 (P3): same root cause as cat-g-7e38f9708e20;
    closes as ride-along.

  - cat-b-6177f36636fb (P2): registerAgent client fn orphan. By-design
    per pull-only deployment model. Fix (audit recommendation:
    "document"): added a closure docblock above the export in
    client.ts + a new "Registration is by-design pull-only" paragraph
    in docs/architecture.md::Agents section explaining when/why a
    future GUI-driven enrollment feature might reach the endpoint
    (proxy-agent topologies for network appliances).

  - cat-i-7c8b28936e3d (P2): CLI scope intentionally narrow but
    undocumented. Fix: new "Scope (intentionally narrow)" subsection
    in docs/features.md::CLI capturing the SSH-into-prod / day-to-day
    GUI / AI-automation MCP three-way split.

Verification:
- go build ./... — clean
- go vet ./... — clean
- go test ./internal/scheduler/... ./internal/config/... — pass
- golangci-lint v2.11.4 run ./... — 0 issues
- tsc --noEmit (frontend) — clean
- All sibling guardrails (S-1 / G-3 / D-1+D-2 / B-1 / L-1 / H-1) still pass

Audit findings closed:
- cat-u-vite_dev_proxy_plaintext_drift (P2)
- cat-g-7e38f9708e20 (P3)
- diff-10xmain-2bf4a0a60388 (P3)
- cat-b-6177f36636fb (P2)
- cat-i-7c8b28936e3d (P2)
- (audit-bookkeeping ride-along: ensures every closed-bundle row has a non-empty merge SHA)

Deferred follow-ups: none from this bundle. The remaining audit
backlog (frontend test campaign, F-1 CertificatesPage UX, P-1
orphan-fn sweep, S-2 handler error-mapping refactor) is sibling
sub-bundles in this mega-prompt.

internal/config/config.go

@@ -784,6 +784,18 @@ type SchedulerConfig struct {
 	// second.
 	// Setting: CERTCTL_JOB_AWAITING_APPROVAL_TIMEOUT environment variable.
 	AwaitingApprovalTimeout time.Duration
+
+	// ShortLivedExpiryCheckInterval is how often the scheduler scans
+	// short-lived certificates and marks expired rows as Expired. Default:
+	// 30 seconds (matches the in-memory default in scheduler.NewScheduler).
+	// C-1 closure (cat-g-7e38f9708e20 + diff-10xmain-2bf4a0a60388):
+	// pre-C-1 the setter scheduler.SetShortLivedExpiryCheckInterval was
+	// defined + tested but never called from cmd/server/main.go, so the
+	// 30-second default was effectively hardcoded. Operators who needed
+	// to tune the cadence (e.g. a high-churn short-lived cert tenant)
+	// had no path. Post-C-1 main.go wires this knob.
+	// Setting: CERTCTL_SHORT_LIVED_EXPIRY_CHECK_INTERVAL environment variable.
+	ShortLivedExpiryCheckInterval time.Duration
 }
 
 // LogConfig contains logging configuration.
@@ -948,6 +960,9 @@ func Load() (*Config, error) {
 			JobTimeoutInterval:        getEnvDuration("CERTCTL_JOB_TIMEOUT_INTERVAL", 10*time.Minute),
 			AwaitingCSRTimeout:        getEnvDuration("CERTCTL_JOB_AWAITING_CSR_TIMEOUT", 24*time.Hour),
 			AwaitingApprovalTimeout:   getEnvDuration("CERTCTL_JOB_AWAITING_APPROVAL_TIMEOUT", 168*time.Hour),
+			// C-1 closure: matches the in-memory default at
+			// internal/scheduler/scheduler.go:145 (30 * time.Second).
+			ShortLivedExpiryCheckInterval: getEnvDuration("CERTCTL_SHORT_LIVED_EXPIRY_CHECK_INTERVAL", 30*time.Second),
 		},
 		Log: LogConfig{
 			Level:  getEnv("CERTCTL_LOG_LEVEL", "info"),