fix: make native probe installer progress safe under sh

[willwashburn]

The native probe installer runs with set -u; on affected shells the ellipsis immediately after $platform can be interpreted as part of the variable name. Delimit it as ${platform} so installation reaches the binary download reliably.

Validation

• Installer regression suite: 2 tests passed, covering /bin/sh parsing/help and the exact platform progress line under set -u.
• Local full-stack smoke test successfully downloaded and installed the native probe, authorized the device, uploaded synthetic history, and read the resulting session and assistant response in Cloud.

This is the installer companion to the sessions onboarding changes. Unrelated marketing/Flows edits are excluded.

Agent session: codex://threads/01a0bbe4-973f-7a81-928e-4ea6b005be98.

Companion PRs

• relayhistory-cloud
• relayhistory
• cloud

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-20T03:28:58.058351Z	ff6c8eb	PR opened

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 169262f3-7ec2-4ba6-ab03-7cd73d86c5c2

📥 Commits

Reviewing files that changed from the base of the PR and between 9aa005b and ff6c8eb.

📒 Files selected for processing (2)

• web/lib/test/probe-install.test.ts
• web/public/install.sh

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📝 Walkthrough

Walkthrough

The installer now uses ${platform} in its progress message. New tests validate shell syntax, help output, and progress output under set -u.

Changes

Installer validation

Layer / File(s)	Summary
Installer output and validation web/public/install.sh, web/lib/test/probe-install.test.ts	The progress message uses ${platform}. Tests validate POSIX syntax, --help output, and darwin-arm64… progress output under set -u.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description accurately explains the ${platform} fix, the shell parsing issue, and the validation results.
Title check	✅ Passed	The title clearly identifies the native probe installer fix and its shell-safety purpose.

✨ Finishing Touches

📝 Generate docstrings

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• Create a new PR

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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_{A rabbit checks the shell at dawn
${platform} hops along
Help text shines with steady cheer
Darwin progress prints clear
Safe under set -u
Tests bloom in green anew}

_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

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