Point embedded skill's CLI repo reference at this fork (#5)

The Agent Skill's "Learn More" linked to upstream basecamp/fizzy-cli. This
fork is the source of the installed `fizzy`, so point it here and document
build/install/update plus the fork-only @mention patch (runtime fix: #2).

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: waynemsmith

skills/fizzy/SKILL.md

@@ -1154,4 +1154,8 @@ fizzy auth status                        # Shows configured profile and API URL
 ## Learn More
 
 - API documentation: https://github.com/basecamp/fizzy/blob/main/docs/API.md
-- CLI repository: https://github.com/basecamp/fizzy-cli
+- CLI repository (this fork is the source of the `fizzy` command): https://github.com/Concurrent-Systems/fizzy-cli
+  - Local clone: `~/g/fizzy-cli-fork` (branch `master` = upstream + our patches)
+  - Build & install: `cd ~/g/fizzy-cli-fork && make build && cp bin/fizzy ~/.local/bin/fizzy`
+  - Update: `git checkout master && git pull`, then rebuild/install. Upstream sync via the `upstream` remote (`basecamp/fizzy-cli`).
+  - `@mention` resolution is a fork-only patch (not upstreamed); runtime fetch fix tracked in issue #2.