fix(runtime): synchronize concurrent terminal state

[matdev83]

Changes

• serialize attempt accounting mutation and snapshots during concurrent Recv/Close/terminal settlement
• detach tool/prompt sideband references safely without mutating a Recv-owned assembler
• freeze terminal decision provider identity under the existing decision lock
• publish test attempt slots only after helper inheritance is complete
• reset the core line budget to measured race-safe size plus 25 lines

Evidence

• classified all 32 race warnings from exact Linux run 33844396281 into accounting teardown, sideband teardown, provider identity, and test helper publication roots
• focused concurrent terminal tests pass 10x
• full internal/core/runtime suite passes
• exact scoped packages pass without race locally (Windows race unavailable)
• internal/archtest passes

[coderabbitai]

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