Align CLI and VS Code tool rendering in HTML export

[Arithmomaniac]

Problem

CLI and VS Code chat sessions use fundamentally different data shapes for equivalent operations. While the HTML exporter normalizes both into the same template, significant visual divergences remain in exported HTML.

Analysis report: Generated via scripts/analyze_rendering_divergences.py using real session data (713MB DB, 994 sessions). Report at temp_export/rendering_divergences_report.html.

Key Divergences

Category	CLI	VS Code	Impact
Status values	success/error	completed only	Low (CSS handles both)
Terminal commands	Rich CommandRun with command+output	Generic run_in_terminal ToolInvocation	High
Content block description	Tool name (view, grep)	None	Low
Invocation messages	Specific: Viewing file.py	Generic: Using "Replace String in File"	Medium
Input data	Always JSON	NULL for built-in tools	Medium
Source type	None/mcp	internal/mcp/extension	None (template handles)
CLI-only blocks	intent, skill, ask_user	N/A	None (correctly CLI-specific)

Approach

All changes are in src/copilot_session_tools/scanner/vscode.py — upgrading the VS Code scanner to produce richer, CLI-compatible output. No changes needed to the HTML template or CLI scanner.

Sub-issues

• D1: Normalize VS Code status values (completed → success) #55 — D1: Normalize VS Code status values (completed → success)
• D2: Convert VS Code terminal tools to CommandRun objects #56 — D2: Convert VS Code terminal tools to CommandRun objects
• D3: Populate VS Code content block description field #57 — D3: Populate content block description field
• D4: Generate CLI-style invocation messages for VS Code built-in tools #58 — D4: Generate CLI-style invocation messages for VS Code built-in tools
• D6: Broaden VS Code built-in tool input extraction #59 — D6: Broaden VS Code built-in tool input extraction
• Tests and snapshot baselines for rendering alignment changes #60 — Tests and snapshot baselines

Coordination

Must avoid conflicts with feature/avilevin/agent-nested-collapsibles branch (adds sub-agent collapsibles). All changes are designed to be fully additive — no restructuring of existing flow.