fix(terminal): fix output loss on cold terminals by moving read() int…

[xavier-arosemena]

…o onDidStartTerminalShellExecution (Zoo-Code-Org#800) (Zoo-Code-Org#834)

• fix(terminal): detect D marker directly to recover from lost VSCode shell-integration completion signals

• fix(terminal): move execution.read() into onDidStartTerminalShellExecution to fix cold-terminal zero-chunk output loss

• fix(terminal): update unit tests for read()-in-TerminalRegistry architecture

• fix(terminal): fix Windows CI test timing and improve coverage

• fix(terminal): address code review findings

• fix(terminal): address CodeRabbit review findings

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• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
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