chore: install deps before surveying in dependency update command [RED-709]

Phase 1 of the dependency-update command sent the operator straight to
`pnpm outdated -r`. That command compares the installed tree against the
registry, so in a tree without node_modules it reports every direct
dependency as `missing (wanted ...)` — including ones already up to date —
instead of only what is outdated, making the survey useless.

A fresh git worktree never has node_modules, since gitignored artifacts are
not shared between worktrees, so the survey fails there by default. Add the
install step and a tripwire describing the all-`missing` output, so the next
operator recognises the failure instead of re-deriving it.

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

Author: sorccu

.claude/commands/checkly-cli-update-dependencies.md

@@ -21,7 +21,8 @@ All paths below are relative to the repo root unless noted otherwise.
 
 ## Phase 1: Survey what is outdated
 
-- [ ] Run `pnpm outdated -r` to list outdated direct dependencies across all workspace packages.
+- [ ] Run `pnpm install` first. `pnpm outdated` compares the **installed** tree against the registry, so without `node_modules` it reports every package as `missing (wanted …)` and the survey is worthless — it lists every direct dependency, including ones already up to date, rather than only what is actually outdated. A fresh git worktree never has `node_modules` (gitignored artifacts are not shared between worktrees), so this step is essential there; elsewhere it is idempotent and safe to repeat.
+- [ ] Run `pnpm outdated -r` to list outdated direct dependencies across all workspace packages. If the `Current` column reads `missing` for everything, the install above did not happen — stop and install before going further.
 
 ## Phase 2: Choose target versions (compatibility- and embargo-aware)