chore: install onsager-ai/dev-skills on SessionStart in cloud (#303)

* chore: install onsager-ai/dev-skills on SessionStart in cloud

Adds a web-only SessionStart hook (.claude/hooks/session-start.sh)
that runs `npx skills add -g onsager-ai/dev-skills --skill '*' -a
claude-code` so Claude Code on the web sessions land with the cross-
repo dev-skills bundle already installed under ~/.claude/skills/.
Gated on $CLAUDE_CODE_REMOTE=true so local terminal sessions stay
untouched.

* chore: make dev-skills install best-effort and drop double -y

- Wrap `npx skills add` in `if !` so a transient npm/registry/GitHub
  failure logs a warning and lets the session continue without the
  bundle (was: hook would exit non-zero under `set -e`).
- Drop the trailing `-y` (now passed only to `npx`); the `skills`
  CLI's agent-detect already installs non-interactively under
  Claude Code.

Addresses Copilot review feedback on the parallel PRs in
onsager-ai/onsager#424, onsager-ai/duhem#57, #303,
onsager-ai/onsager-skills#20, and onsager-ai/telegramable#65.

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: tikazyq

.claude/hooks/session-start.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+set -euo pipefail
+
+# Cloud-only: in Claude Code on the web, every container starts fresh, so we
+# install the onsager-ai/dev-skills bundle into ~/.claude/skills/ on each
+# session start. Local terminal sessions are skipped so a developer's
+# hand-installed skills are left alone.
+if [ "${CLAUDE_CODE_REMOTE:-}" != "true" ]; then
+  exit 0
+fi
+
+# Best-effort: a transient npm/registry/GitHub blip shouldn't fail the whole
+# session start. On failure we log a warning and let the session continue
+# without the bundle.
+echo "--- installing onsager-ai/dev-skills globally ---"
+if ! npx -y skills add -g onsager-ai/dev-skills --skill '*' -a claude-code; then
+  echo "warning: onsager-ai/dev-skills install failed; session will start without the bundle." >&2
+fi

.claude/settings.json

@@ -5,7 +5,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "echo '--- codervisor hooks: no setup needed ---'"
+            "command": "bash .claude/hooks/session-start.sh"
           }
         ]
       }