Remove duplicate logging in session.go, fix logUnified misuse

[Copilot]

session.go had three dual-logging antipatterns where the same event was written to both logSession/logUnified (debug logger) and log (stdlib), causing double log entries and split authority over session log messages.

Changes

• Remove exact duplicate (getSessionID): dropped log.Printf("Extracted session ID from context: …") — identical to the logSession.Printf above it
• Remove near-identical duplicate (requireSession): dropped log.Printf("Checking session for ID: …") — same event as logSession.Printf
• Remove dual log (ensureSessionDirectory): dropped log.Printf("Created payload directory for session: …") — redundant after switching to logSession
• Fix logger inconsistency (ensureSessionDirectory): changed logUnified.Printf(…) → logSession.Printf(…) — session-scoped events belong on the session logger, not the unified server logger

Before:

// getSessionID — double-writes on every call
logSession.Printf("Extracted session ID from context: %s", auth.TruncateSessionID(sessionID))
log.Printf("Extracted session ID from context: %s", auth.TruncateSessionID(sessionID))

// ensureSessionDirectory — wrong logger + duplicate
logUnified.Printf("Created session directory: %s", sessionDir)
log.Printf("Created payload directory for session: %s", auth.TruncateSessionID(sessionID))

After:

logSession.Printf("Extracted session ID from context: %s", auth.TruncateSessionID(sessionID))

logSession.Printf("Created session directory: %s", sessionDir)

Non-duplicate log.Printf calls (no session ID in context, auto-creating/auto-created session, session validated) are retained.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• example.com
  • Triggering command: /tmp/go-build3212929701/b334/launcher.test /tmp/go-build3212929701/b334/launcher.test -test.testlogfile=/tmp/go-build3212929701/b334/testlog.txt -test.paniconexit0 -test.timeout=10m0s conf�� tion_pool.go er.go x_amd64/compile (dns block)
• invalid-host-that-does-not-exist-12345.com
  • Triggering command: /tmp/go-build3212929701/b319/config.test /tmp/go-build3212929701/b319/config.test -test.testlogfile=/tmp/go-build3212929701/b319/testlog.txt -test.paniconexit0 -test.timeout=10m0s is ternal/engine/wazevo/wazevoapi/debug_options.go ternal/engine/wazevo/wazevoapi/exitcode.go x_amd64/compile (dns block)
• nonexistent.local
  • Triggering command: /tmp/go-build3212929701/b334/launcher.test /tmp/go-build3212929701/b334/launcher.test -test.testlogfile=/tmp/go-build3212929701/b334/testlog.txt -test.paniconexit0 -test.timeout=10m0s conf�� tion_pool.go er.go x_amd64/compile (dns block)
• slow.example.com
  • Triggering command: /tmp/go-build3212929701/b334/launcher.test /tmp/go-build3212929701/b334/launcher.test -test.testlogfile=/tmp/go-build3212929701/b334/testlog.txt -test.paniconexit0 -test.timeout=10m0s conf�� tion_pool.go er.go x_amd64/compile (dns block)
• this-host-does-not-exist-12345.com
  • Triggering command: /tmp/go-build3212929701/b343/mcp.test /tmp/go-build3212929701/b343/mcp.test -test.testlogfile=/tmp/go-build3212929701/b343/testlog.txt -test.paniconexit0 -test.timeout=10m0s /tmp/go-build3212929701/b334/_pkg_.a ache/go/1.25.8/x64/src/runtime/c-c=4 73cQFc0nv x_amd64/vet (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[Copilot]

Pull request overview

Removes duplicate session-related log entries and aligns session directory logging to use the session-scoped logger, reducing noisy/double-written logs in the server session lifecycle.

Changes:

• Remove duplicate log.Printf lines in getSessionID and requireSession.
• Switch ensureSessionDirectory from logUnified/stdlib log duplicates to logSession only.

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[Copilot]

sessionDir includes the raw sessionID (which is the API key per spec) and is being logged verbatim. This can leak credentials into logs; prefer logging auth.TruncateSessionID(sessionID) and avoid printing the full path that embeds the secret.

[Copilot]

sessionID comes from the client and is used directly in filepath.Join(us.payloadDir, sessionID) and os.MkdirAll(sessionDir, ...). As written, a session ID containing .. (or an absolute path) can escape payloadDir and create directories elsewhere. Consider normalizing/validating the session ID (e.g., reject path traversal segments / absolute paths) and/or verify after filepath.Clean/filepath.Abs that the resulting path stays under us.payloadDir before calling MkdirAll.