feat: restructure fork on upstream v1.2.18

[kulvirgit]

Summary

Restructures our fork onto upstream OpenCode v1.2.18 for clean upstream mergeability.

• All custom code isolated into src/altimate/ (68 tools, 3 bridge files, 5 prompts, telemetry, plugin, CLI)
• Upstream files marked with altimate_change markers (21 blocks across 9 files)
• Upstream merge tooling added (script/upstream/) — analyze, merge, transforms, verify scripts
• Zero upstream packages deleted — all kept intact for conflict-free future merges
• Telemetry instrumentation with Azure Application Insights, CI/CD workflows, docs site, CLI improvements

Backup repo: https://github.com/AltimateAI/altimate-code-backup (full copy of current main before merge)

Commits

Author	Message
Kulvir	feat: add Altimate data engineering platform
Anand	feat: telemetry instrumentation, CI/CD, docs, and CLI improvements

How it works

Uses git merge --strategy ours to replace the old fork structure entirely with the restructured codebase while preserving history linkage. After merge, the repo will be on upstream v1.2.18 with our customizations cleanly layered on top.

Verification

• All 68 custom tools present in src/altimate/tools/
• 71/71 Python engine files byte-identical
• All altimate_change marker blocks verified (every start has end)
• Build passes, typecheck passes (13/13 packages)

Test plan

• bun run build passes
• bun turbo typecheck passes
• Smoke test CLI locally
• Verify merge tooling: bun run script/upstream/analyze.ts --version v1.2.18

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