Fix timeout when reusing older Brancher nodes

[Copilot]

Reused Branchers older than ~1 week no longer have ensure_app/ensure_copied_app flows in their logbook, causing 404s until timeout.

Changes

• Check SSH first for reused Branchers: New waitForReusedAvailability() method attempts SSH connectivity before checking logbook flows
• Extract reusable SSH check: checkSshReachability() method consolidates SSH polling logic with proper timeout tracking
• Fixed 10-second SSH check: Initial SSH check uses a simple 10-second timeout before falling back to logbook wait

Flow

Before (all Branchers):

1. Poll logbook for ensure_app/ensure_copied_app flows → 404s on old Branchers
2. Check SSH connectivity

After (reused Branchers only):

1. Check SSH connectivity (10 seconds) → Return immediately if reachable
2. If not reachable, fall back to logbook polling + SSH check (full timeout)

// DeployRunner now tracks reuse status
$isReused = false;
if ($reuseBrancher && $brancherApp = $this->brancherHypernodeManager->reuseExistingBrancherHypernode($parentApp, $labels)) {
    $isReused = true;
}

// And calls appropriate method
if ($isReused) {
    $this->brancherHypernodeManager->waitForReusedAvailability($brancherApp, ...);
} else {
    $this->brancherHypernodeManager->waitForAvailability($brancherApp, ...);
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Reusing older brancher node fails</issue_title>
<issue_description>Sometimes, when reusing a Brancher older than a week, there is no ensure_copied_app / ensure_app flow in the logbook anymore. So it will 404 all the time, until it reaches the timeout, then it raises TimeoutException.

When reusing a Brancher, we should try to poll for SSH first, then if it isn't reachable, do the wait for availability process.

Example job: https://github.com/ByteInternet/hypernode-docs-next/actions/runs/20754105263/job/59658811645</issue_description>

<agent_instructions>Please when doing extra SSH polling, take code reuse into account.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Reusing older brancher node fails #185

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[tdgroot]

No need for fancy calculation, just try this for 10 seconds.

[Copilot]

Done in 7e30c4b - simplified to use a fixed 10-second timeout for the initial SSH check.