test(session): Add BVA negative testing gaps and QA journal

[theRebelliousNerd]

What:

• Created a 400+ line QA journal entry (.quality_assurance/qa_journal_2026-08-20_04-12-44_EST.md) documenting Boundary Value Analysis findings for internal/session/spawner.go.
• Appended // TODO: TEST_GAP: comments to internal/session/spawner_test.go corresponding to each gap identified in the journal.

Coverage:

• No executable code was modified, only tests and documentation.
• Ran go test ./internal/session/... to ensure test suite remains passing.

Result:

• QA artifacts are stored for roadmap planning.
• spawner_test.go explicitly tracks missing negative test coverage.

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PR created automatically by Jules for task 2761969980309559173 started by @theRebelliousNerd

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