refactor: rename CLI command 'inkreach' -> 'inkreach-teable'

Rename the command (and its config namespace) to match the project name:

- bin:          inkreach        -> inkreach-teable
- program name: inkreach        -> inkreach-teable
- config dir:   ~/.inkreach/    -> ~/.inkreach-teable/
- env vars:     INKREACH_*      -> INKREACH_TEABLE_*
- all docs (SKILL.md, guides, api-reference, AGENTS.md, design doc, install.sh)

Unchanged (intentional):
- npm package name: @inkreach/teable-cli
- package directory: packages/inkreach-cli/
- skill name: inkreach-teable-ops
- organization/authors: 'inkreach' (npm scope @inkreach)

Existing config auto-migrated (~/.inkreach -> ~/.inkreach-teable). Verified
end-to-end: auth status, workflow list (636), build clean.

package.json

@@ -1,11 +1,11 @@
 {
   "name": "@inkreach/teable-cli",
   "version": "0.1.0",
-  "description": "CLI for operating inkreach-teable: tables, fields, records, views, and the self-built automation engine (8 triggers + 6 actions).",
+  "description": "CLI (command: inkreach-teable) for operating inkreach-teable: tables, fields, records, views, and the self-built automation engine (8 triggers + 6 actions).",
   "license": "MIT",
   "type": "commonjs",
   "bin": {
-    "inkreach": "./dist/bin.js"
+    "inkreach-teable": "./dist/bin.js"
   },
   "main": "dist/bin.js",
   "scripts": {