chore: rename remaining qwibitai/nanoclaw references to nanocoai/nanoclaw

Sweep of outbound strings, doc URLs, comments, and clone instructions
that were missed in the original org rename. One both-match case in
setup/lib/channels-remote.sh (URL detection) accepts either name so
existing forks with a `qwibitai` remote continue to resolve cleanly;
everywhere else is a straight rename.

Historical mentions left intact:
- CHANGELOG.md (v2.0.0 entry, frozen history)
- .claude/skills/add-gmail-tool/SKILL.md (pre-v2 qwibitai skill — historical)
- repo-tokens/badge.svg (auto-regenerated by update-tokens.yml)

.claude/skills/update-nanoclaw/SKILL.md

@@ -11,7 +11,7 @@ Run `/update-nanoclaw` in Claude Code.
 
 ## How it works
 
-**Preflight**: checks for clean working tree (`git status --porcelain`). If `upstream` remote is missing, asks you for the URL (defaults to `https://github.com/qwibitai/nanoclaw.git`) and adds it. Detects the upstream branch name (`main` or `master`).
+**Preflight**: checks for clean working tree (`git status --porcelain`). If `upstream` remote is missing, asks you for the URL (defaults to `https://github.com/nanocoai/nanoclaw.git`) and adds it. Detects the upstream branch name (`main` or `master`).
 
 **Backup**: creates a timestamped backup branch and tag (`backup/pre-update-<hash>-<timestamp>`, `pre-update-<hash>-<timestamp>`) before touching anything. Safe to run multiple times.
 
@@ -69,7 +69,7 @@ If output is non-empty:
 Confirm remotes:
 - `git remote -v`
 If `upstream` is missing:
-- Ask the user for the upstream repo URL (default: `https://github.com/qwibitai/nanoclaw.git`).
+- Ask the user for the upstream repo URL (default: `https://github.com/nanocoai/nanoclaw.git`).
 - Add it: `git remote add upstream <user-provided-url>`
 - Then: `git fetch upstream --prune`