chore: wave2 fork customizations doc (#3)

Document light-customization fork governance for AiFeatures/OpenShell: upstream NVIDIA/OpenShell, sync cadence quarterly, owner @ashsolei. Standardizes per enterprise fork-governance.md and the fork-upstream-merge runbook.

Author: ashsolei

FORK-CUSTOMIZATIONS.md

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+# Fork Customizations
+
+> Upstream: [NVIDIA/OpenShell](https://github.com/NVIDIA/OpenShell)
+> Fork maintained by: @ashsolei
+> Last reviewed: 2026-04-08
+> Fork type: **light-customization**
+> Sync cadence: **quarterly**
+
+## Purpose of Fork
+
+NVIDIA OpenShell fork; iAiFy evaluation-only scope with enterprise CI overlay.
+
+## Upstream Source
+
+| Property | Value |
+|---|---|
+| Upstream | [NVIDIA/OpenShell](https://github.com/NVIDIA/OpenShell) |
+| Fork org | AiFeatures |
+| Fork type | light-customization |
+| Sync cadence | quarterly |
+| Owner | @ashsolei |
+
+## Carried Patches
+
+Local commits ahead of `upstream/main` at last review:
+
+- `908ffd7d docs: add iAiFy Fork Notes block to README (#2)`
+- `a95991f0 chore: remove obsolete .agents/skills definitions`
+- `a60ce82d ci: add dependabot.yml for iAiFy governance`
+- `88d4049c docs: add copilot-instructions.md for iAiFy governance`
+
+## Supported Components
+
+- Root governance files (`.github/`, `CLAUDE.md`, `AGENTS.md`, `FORK-CUSTOMIZATIONS.md`)
+- Enterprise CI/CD workflows imported from `Ai-road-4-You/enterprise-ci-cd`
+
+## Out of Support
+
+- All upstream source directories are tracked as upstream-of-record; local edits to core source are discouraged.
+
+## Breaking-Change Policy
+
+1. On upstream sync, classify per `governance/docs/fork-governance.md`.
+2. Breaking API/license/security changes auto-classify as `manual-review-required`.
+3. Owner triages within 5 business days; conflicts are logged to the `fork-sync-failure` issue label.
+4. Revert local customizations only after stakeholder sign-off.
+
+## Sync Strategy
+
+This fork follows the [Fork Governance Policy](https://github.com/Ai-road-4-You/governance/blob/main/docs/fork-governance.md)
+and the [Fork Upstream Merge Runbook](https://github.com/Ai-road-4-You/governance/blob/main/docs/runbooks/fork-upstream-merge.md).
+
+- **Sync frequency**: quarterly
+- **Conflict resolution**: Prefer upstream; reapply iAiFy customizations on a sync branch
+- **Automation**: [`Ai-road-4-You/fork-sync`](https://github.com/Ai-road-4-You/fork-sync) workflows
+- **Failure handling**: Sync failures create issues tagged `fork-sync-failure`
+
+## Decision: Continue, Rebase, Refresh, or Replace
+
+| Option | Current Assessment |
+|---|---|
+| Continue maintaining fork | yes - governance overlay only |
+| Full rebase onto upstream | feasible on request |
+| Fresh fork (discard local changes) | acceptable |
+| Replace with upstream directly | possible |
+
+## Maintenance
+
+- **Owner**: @ashsolei
+- **Last reviewed**: 2026-04-08
+- **Reference runbook**: `ai-road-4-you/governance/docs/runbooks/fork-upstream-merge.md`