[Repo Assist] refactor(launcher): eliminate double config lookup in GetOrLaunchForSession

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Summary

When GetOrLaunchForSession handles an HTTP backend, it previously called getServerConfig once (acquiring the read lock), then immediately delegated to GetOrLaunch which called getServerConfig a second time — acquiring the same read lock twice per HTTP request.

Root Cause

GetOrLaunchForSession needed to know the backend type before routing. For HTTP backends it called GetOrLaunch, which blindly re-fetched the config:

// Before: two lock acquisitions for HTTP
func GetOrLaunchForSession(...) {
    serverCfg, _ := l.getServerConfig(serverID) // lock #1
    if serverCfg.Type == "http" {
        return GetOrLaunch(l, serverID)          // lock #2 inside
    }
}

Fix

Extract the inner logic of GetOrLaunch into a private getOrLaunchWithConfig helper that accepts a pre-fetched *config.ServerConfig. Both public functions now call this helper after their single config lookup:

// After: one lock acquisition per request
func GetOrLaunchForSession(...) {
    serverCfg, _ := l.getServerConfig(serverID)  // lock #1 only
    if serverCfg.Type == "http" {
        return getOrLaunchWithConfig(l, serverID, serverCfg) // no extra lock
    }
}

Trade-offs

• No public API changes — GetOrLaunch and GetOrLaunchForSession signatures are unchanged.
• No behaviour change — The new getOrLaunchWithConfig is a verbatim extraction of the existing syncutil.GetOrCreate call body.
• Minor lock contention reduction — For HTTP backends routed through GetOrLaunchForSession, the getServerConfig RLock is acquired once instead of twice.

Addresses: #7254

Test Status

⚠️ Infrastructure failure: go build and go test require downloading modules from proxy.golang.org, which is blocked by the network firewall in this environment. The code change is a straightforward extraction with no behavioural changes — the getOrLaunchWithConfig body is an exact verbatim copy of the original syncutil.GetOrCreate closure in GetOrLaunch. All existing tests for GetOrLaunchForSession_HTTPBackend, GetOrLaunch_*, and related launchers remain valid and unchanged.

• ✅ gofmt — no formatting changes
• ⚠️ go build — blocked (proxy.golang.org unreachable in CI sandbox)
• ⚠️ go test — blocked (same reason)

Warning

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[Copilot]

Pull request overview

Refactors the launcher’s connection acquisition flow to avoid redundant server config lookups (and associated RWMutex RLock acquisitions) when GetOrLaunchForSession routes HTTP backends through the stateless connection pool.

Changes:

• Extracts the shared syncutil.GetOrCreate launch logic into a new private helper getOrLaunchWithConfig.
• Updates GetOrLaunch to fetch config once and delegate to getOrLaunchWithConfig.
• Updates GetOrLaunchForSession to reuse its already-fetched config when routing HTTP backends.

Show a summary per file

File	Description
internal/launcher/launcher.go	Extracts shared launch logic to reuse a single config lookup/lock acquisition across HTTP routing paths.

Copilot's findings

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• Files reviewed: 1/1 changed files
• Comments generated: 1

[lpcox]

@copilot address review feedback

[Copilot]

@copilot address review feedback

Addressed in 06d08fb. I restored the GetOrLaunch called for server debug log on the HTTP path inside GetOrLaunchForSession before delegating to getOrLaunchWithConfig, preserving prior observable logging behavior while keeping the single config lookup.