feat(cli): add channel-aware update notifier (#265)

* feat(cli): show cached update notices after commands

* docs(cli): describe update notices

* fix(cli): type update check environment

* fix(cli): decouple update notice display from refresh and harden suppression

Display a cached "update available" notice based solely on the lastNoticeAt
24h throttle, independent of checkedAt refresh freshness, matching the design's
independent display/refresh decisions. Suppress the check unconditionally under
--json, CI, and non-TTY before consulting output-mode preferences, so a
KTX_OUTPUT=pretty override can no longer make CI/non-TTY contexts phone npm.

pnpm-lock.yaml

@@ -209,6 +209,9 @@ importers:
       react:
         specifier: ^19.2.6
         version: 19.2.6
+      semver:
+        specifier: ^7.8.1
+        version: 7.8.1
       simple-git:
         specifier: 3.36.0
         version: 3.36.0
@@ -243,6 +246,9 @@ importers:
       '@types/react':
         specifier: ^19.2.15
         version: 19.2.15
+      '@types/semver':
+        specifier: ^7.7.1
+        version: 7.7.1
       '@vitest/coverage-v8':
         specifier: ^4.1.7
         version: 4.1.7(vitest@4.1.7)
@@ -2501,6 +2507,9 @@ packages:
   '@types/readable-stream@4.0.23':
     resolution: {integrity: sha512-wwXrtQvbMHxCbBgjHaMGEmImFTQxxpfMOR/ZoQnXxB1woqkUbdLGFDgauo00Py9IudiaqSeiBiulSV9i6XIPig==}
 
+  '@types/semver@7.7.1':
+    resolution: {integrity: sha512-FmgJfu+MOcQ370SD0ev7EI8TlCAfKYU+B4m5T3yXc1CiRN94g/SZPtsCkk506aUDtlMnFZvasDwHHUcZUEaYuA==}
+
   '@types/triple-beam@1.3.5':
     resolution: {integrity: sha512-6WaYesThRMCl19iryMYP7/x2OVgCtbIVflDGFpWnb9irXI3UjYE4AzmYuiUKY1AJstGijoY+MgUszMgRxIYTYw==}
 
@@ -5219,6 +5228,11 @@ packages:
     engines: {node: '>=10'}
     hasBin: true
 
+  semver@7.8.1:
+    resolution: {integrity: sha512-rkVq3IXh+4FDGch+KwzX3aV9W3kO54GyEgpvBzSyctDA6Xtd7RJQV1xmXbeQp5v7+VzLOfVqiutSE6GICgPFvg==}
+    engines: {node: '>=10'}
+    hasBin: true
+
   send@1.2.1:
     resolution: {integrity: sha512-1gnZf7DFcoIcajTjTwjwuDjzuz4PPcY2StKPlsGAQ1+YH20IRVrBaXSWmdjowTJ6u8Rc01PoYOGHXfP1mYcZNQ==}
     engines: {node: '>= 18'}
@@ -8321,6 +8335,8 @@ snapshots:
     dependencies:
       '@types/node': 24.12.4
 
+  '@types/semver@7.7.1': {}
+
   '@types/triple-beam@1.3.5': {}
 
   '@types/unist@2.0.11': {}
@@ -11433,6 +11449,8 @@ snapshots:
 
   semver@7.8.0: {}
 
+  semver@7.8.1: {}
+
   send@1.2.1:
     dependencies:
       debug: 4.4.3