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.

docs/features.md

@@ -1220,6 +1220,10 @@ Latching state prevents refetch-driven dismissal. `localStorage` dismissal key:
 
 `certctl-cli` — stdlib-only (`flag` + `text/tabwriter`), no Cobra dependency.
 
+### Scope (intentionally narrow)
+
+The CLI focuses on **read-heavy operator triage** (list, get, status, version) and **bulk-action surface** (`certs bulk-revoke`, `import`). It deliberately omits admin CRUD for issuers, targets, owners, teams, agent groups, certificate profiles, renewal policies, policy rules, and notifications — those live in the GUI and the MCP server (rebuild count via `grep -cE 'gomcp\.AddTool\(' internal/mcp/tools.go` for the full operator surface). This split is intentional: CLI is the SSH-into-the-prod-host emergency console; GUI is the day-to-day operator console; MCP is the AI/automation surface. Closes audit finding `cat-i-7c8b28936e3d` — pre-this-doc the narrow scope was correct in code but confused readers who scanned `docs/features.md`'s "CLI commands" count and assumed the CLI was incomplete.
+
 ### Commands
 
 | Command | Description |