docs: update README with complete Phase 2 TLS documentation

- Update HTTPS/TLS feature section: remove (Phase 2) placeholders,
  document Tailscale (tailscale cert), mkcert (zero browser warnings),
  and self-signed (browser warning) methods with accurate descriptions
- Update HTTPS/TLS setup examples: add --method tailscale/mkcert/selfsigned
  and --status commands, detection priority explanation paragraph,
  and 90-day Tailscale cert renewal note
- Update CLI reference: change description to Tailscale/mkcert/self-signed,
  add setup-tls --status entry with 'Show current TLS configuration'
- Update tests: replace Phase-2-placeholder test with 10 new tests
  covering all Phase 2 requirements (no placeholders, all methods,
  status command, detection priority, cert renewal note)

README.md

@@ -56,11 +56,11 @@
 
 ### HTTPS / TLS
 
-- `muxplex setup-tls` — set up TLS certificates for HTTPS (auto-detects best method)
-- **Tailscale** *(Phase 2)* — automatic HTTPS via Tailscale funnel
-- **mkcert** *(Phase 2)* — locally-trusted development certificates via mkcert
-- **Self-signed fallback** — generates a self-signed cert when no other method is available
-- **Clipboard API** — HTTPS is required for clipboard access in most browsers
+- `muxplex setup-tls` — auto-detect and set up TLS certificates
+- **Tailscale** — real Let's Encrypt certs via `tailscale cert` (recommended)
+- **mkcert** — locally-trusted certs, zero browser warnings
+- **Self-signed** — fallback for immediate HTTPS (browser shows warning)
+- Required for browser clipboard API on non-localhost
 
 ---
 
@@ -148,7 +148,8 @@ muxplex upgrade [--force]            Smart update with version check
 muxplex doctor                       Check dependencies + config
 muxplex show-password                Show current auth password
 muxplex reset-secret                 Regenerate signing secret
-muxplex setup-tls [--method auto]   Set up TLS certs for HTTPS
+muxplex setup-tls [--method auto]   Set up TLS certs (Tailscale/mkcert/self-signed)
+muxplex setup-tls --status          Show current TLS configuration
 ```
 
 ### Service management
@@ -189,16 +190,25 @@ muxplex serve --host 0.0.0.0
 # Auto-detect the best TLS method and set up certificates
 muxplex setup-tls
 
-# Use self-signed certificates explicitly
+# Use a specific TLS method
+muxplex setup-tls --method tailscale
+muxplex setup-tls --method mkcert
 muxplex setup-tls --method selfsigned
 
+# Show current TLS status and configuration
+muxplex setup-tls --status
+
 # Override TLS cert/key for a single run (without saving to config)
-muxplex serve --tls-cert /path/to/cert.pem --tls-key /path/to/key.pem
+muxplex serve --tls-cert /path/cert.pem --tls-key /path/key.pem
 
 # Check TLS configuration and dependencies
 muxplex doctor
 ```
 
+Auto-detection priority: **Tailscale** (if `tailscale` is installed and a cert is available) → **mkcert** (if `mkcert` is installed) → **self-signed** (always available as a fallback). Use `--method` to override.
+
+> **Note:** Tailscale certs have a 90-day expiry. Run `muxplex setup-tls --method tailscale` to renew when needed.
+
 ---
 
 ## Configuration

muxplex/tests/test_readme.py

@@ -167,16 +167,89 @@ def test_readme_examples_show_tls_commands():
     )
 
 
-def test_readme_phase_2_items_noted():
-    """README must note Phase 2 items (Tailscale, mkcert) as upcoming."""
+def test_readme_no_phase_2_placeholders():
+    """README must NOT contain any '(Phase 2)' placeholder text."""
+    assert "(Phase 2)" not in README, (
+        "README must not contain '(Phase 2)' placeholder text — Phase 2 is complete"
+    )
+
+
+def test_readme_tls_tailscale_lets_encrypt():
+    """README must document Tailscale as providing real Let's Encrypt certs via tailscale cert."""
+    assert "tailscale cert" in README, (
+        "README must mention 'tailscale cert' command for Let's Encrypt certs"
+    )
     assert "Tailscale" in README, (
-        "README must mention Tailscale as a Phase 2 TLS method"
+        "README must mention Tailscale as a TLS method"
     )
-    assert "mkcert" in README, (
-        "README must mention mkcert as a Phase 2 TLS method"
+
+
+def test_readme_tls_mkcert_zero_browser_warnings():
+    """README must document mkcert as providing locally-trusted certs with zero browser warnings."""
+    assert "mkcert" in README, "README must mention mkcert as a TLS method"
+    assert "zero browser warnings" in README or "browser warnings" in README, (
+        "README must mention that mkcert provides zero browser warnings"
     )
-    assert "Phase 2" in README, (
-        "README must note Phase 2 items as upcoming"
+
+
+def test_readme_tls_selfsigned_browser_warning():
+    """README must document self-signed as fallback with browser warning note."""
+    readme_lower = README.lower()
+    assert "browser shows warning" in readme_lower or "browser warning" in readme_lower, (
+        "README must note that self-signed certs show browser warnings"
+    )
+
+
+def test_readme_tls_setup_status_command():
+    """README must document the 'muxplex setup-tls --status' command."""
+    assert "muxplex setup-tls --status" in README, (
+        "README must document 'muxplex setup-tls --status' command"
+    )
+
+
+def test_readme_tls_setup_method_tailscale():
+    """README must document 'muxplex setup-tls --method tailscale' in examples."""
+    assert "muxplex setup-tls --method tailscale" in README, (
+        "README must show 'muxplex setup-tls --method tailscale' in examples"
+    )
+
+
+def test_readme_tls_setup_method_mkcert():
+    """README must document 'muxplex setup-tls --method mkcert' in examples."""
+    assert "muxplex setup-tls --method mkcert" in README, (
+        "README must show 'muxplex setup-tls --method mkcert' in examples"
+    )
+
+
+def test_readme_tls_detection_priority_explanation():
+    """README must explain detection priority for TLS method auto-detection."""
+    readme_lower = README.lower()
+    assert "detection" in readme_lower or "priority" in readme_lower or "auto-detect" in readme_lower, (
+        "README must explain detection priority for auto-detect TLS method selection"
+    )
+
+
+def test_readme_tls_tailscale_cert_renewal_note():
+    """README must include a note about Tailscale cert renewal (90-day expiry)."""
+    assert "90-day" in README or "90 day" in README or "90 days" in README, (
+        "README must include a note about 90-day Tailscale cert renewal/expiry"
+    )
+
+
+def test_readme_cli_reference_setup_tls_updated():
+    """README CLI Reference must describe setup-tls with Tailscale/mkcert/self-signed."""
+    assert "Tailscale/mkcert/self-signed" in README or "Tailscale/mkcert" in README, (
+        "README CLI Reference must describe setup-tls with Tailscale/mkcert/self-signed methods"
+    )
+
+
+def test_readme_cli_reference_has_setup_tls_status():
+    """README CLI Reference must include setup-tls --status command with description."""
+    assert "setup-tls --status" in README, (
+        "README CLI Reference must include 'setup-tls --status' with description"
+    )
+    assert "Show current TLS" in README or "current TLS configuration" in README, (
+        "README CLI Reference must describe what setup-tls --status does"
     )