fix(model): split provider/model at first separator (slash or colon)

[mauroociappinaph]

Closes #802

Summary

Introduces model.SplitProviderModel helper that splits at the FIRST occurrence of '/' or ':', fixing OpenRouter free model specs like openrouter/qwen/qwen3.6-plus:free which contain both separators.

Applied to the 3 parse sites:

• internal/cli/sync.go: parseModelSpec
• internal/components/sdd/profiles.go: extractModelFromAgent
• internal/components/sdd/read_assignments.go: ReadCurrentModelAssignments

Changes

File	Change
internal/model/split.go	New SplitProviderModel helper (first-separator split)
internal/model/split_test.go	11 test cases covering colon, slash, OpenRouter free/paid, edge cases
internal/cli/sync.go	Use new helper in parseModelSpec
internal/components/sdd/profiles.go	Use new helper in extractModelFromAgent
internal/components/sdd/read_assignments.go	Use new helper in ReadCurrentModelAssignments
internal/components/sdd/profiles_test.go	TestExtractModelFromAgent regression tests
internal/components/sdd/read_assignments_test.go	TestReadCurrentModelAssignmentsOpenRouterFreeSuffix regression test

Test Plan

• go test ./internal/model/... — 11 SplitProviderModel tests pass
• go test ./internal/cli/... — all sync tests pass
• go test ./internal/components/sdd/... — all profiles/read_assignments tests pass
• New regression tests: openrouter/qwen/qwen3.6-plus:free correctly splits to provider=openrouter, model=qwen/qwen3.6-plus:free

Summary by CodeRabbit

• Bug Fixes
  • Improved model specification parsing across the app, including support for both provider/model and provider:model formats.
  • Fixed handling of model names that contain multiple separators, preventing incorrect parsing of certain provider strings.
  • Invalid or incomplete model entries are now safely ignored or reported instead of being misread.
• Tests
  • Added regression coverage for standard and edge-case model parsing scenarios.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 0a78f835-dedc-4010-aaf6-5a3ee8cef3df

📥 Commits

Reviewing files that changed from the base of the PR and between 8df34cd and 0f098e0.

📒 Files selected for processing (7)

• internal/cli/sync.go
• internal/components/sdd/profiles.go
• internal/components/sdd/profiles_test.go
• internal/components/sdd/read_assignments.go
• internal/components/sdd/read_assignments_test.go
• internal/model/split.go
• internal/model/split_test.go

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📝 Walkthrough

Walkthrough

Introduces internal/model/split.go with a shared SplitProviderModel helper that splits on the first / or : separator. Three call sites that previously duplicated manual separator-scan logic (parseModelSpec, extractModelFromAgent, inline parser in ReadCurrentModelAssignments) are each replaced with a call to this helper. Regression tests are added for OpenRouter free model strings.

SplitProviderModel helper and call-site consolidation

Layer / File(s)	Summary
SplitProviderModel helper and unit tests internal/model/split.go, internal/model/split_test.go	New SplitProviderModel splits on the first / or :, returns (providerID, modelID, ok), with table-driven tests covering edge cases and OpenRouter free model regression.
Replace manual parsing in three call sites internal/cli/sync.go, internal/components/sdd/profiles.go, internal/components/sdd/read_assignments.go	parseModelSpec, extractModelFromAgent, and the inline parser in ReadCurrentModelAssignments each replaced with SplitProviderModel; strings import removed from read_assignments.go.
Regression tests for updated call sites internal/components/sdd/profiles_test.go, internal/components/sdd/read_assignments_test.go	TestExtractModelFromAgent and TestReadCurrentModelAssignmentsOpenRouterFreeSuffix verify first-separator splitting for OpenRouter free model strings at both call sites.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 77.78% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: splitting provider/model specs at the first separator.
Linked Issues check	✅ Passed	The PR matches #802 by fixing read-path parsing in all three specified locations and adding regression coverage.
Out of Scope Changes check	✅ Passed	The changes stay focused on the parsing bug and related tests, with no obvious unrelated scope added.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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