fix(ci): restore indexmap serde feature

[KooshaPari]

User description

The current main branch fails forge_ci compilation because IndexMap does not implement serde::Serialize without the serde feature. Restore the workspace dependency feature required by workflow_model derives.

Observed failures: runs 31218142671 and 31218142713.

Co-Authored-By: ForgeCode noreply@forgecode.dev

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CodeAnt-AI Description

Restore CI compilation for serialized workflow data

What Changed

• Re-enables serialization support for indexed maps used by workflow data
• Restores successful compilation in CI and prevents serialization-related build failures

Impact

✅ Passing CI builds
✅ Reliable workflow data serialization

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	3c29020	Aug 07, 2026 · 23:18	23:19

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Code Review Summary

Status: No Issues Found | Recommendation: Merge

The one-line change at Cargo.toml:112 correctly restores the serde feature on the indexmap workspace dependency. This is required because crates/forge_ci/src/workflow_model.rs derives serde::Serialize on Workflow (line 7) and Permissions (line 174), both of which contain IndexMap fields (lines 15, 19, 174); without indexmap's serde feature, IndexMap does not implement Serialize and the crate fails to compile. The serde feature is the correct flag for indexmap 2.x, the version is unchanged (2.13.0), no new dependency is introduced (additive feature flag only), and forge_ci already consumes this via indexmap.workspace = true, so the workspace-level placement is idiomatic. Verified HEAD 3c29020 matches the PR head and confirmed no existing inline comments.

Files Reviewed (1 files)

• Cargo.toml

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_{Reviewed by laguna-s-2.1:free · Input: 155.5K · Output: 10.2K · Cached: 74.8K}

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