feat5: add v3 PRD and roadmap

[rray89]

Summary

This adds a dedicated v3 planning document so future product work can start from one forward-looking source instead of bouncing between the MVP and v2 PRDs. The new doc centers v3 on workout preview, workout history review, and derived records, while also collecting the larger future tracks that should stay out of the immediate implementation scope.

Changes

docs/ironpath-v3-prd.md

• Added a self-contained v3 PRD with the carried-forward product baseline, explicit v3 goals, and non-goals.
• Defined three recommended v3 features: accepted workout preview, workout log detail/history review, and derived records from completed workouts.
• Captured future roadmap tracks for polish, platform work, AI planning, and other deferred features so planning can continue without revisiting the original MVP PRD.

Test Plan

• Reviewed the new PRD content locally for structure, scope, and implementation order.
• Manual check: confirm the proposed v3 feature order still matches current product priorities.
• Edge case: verify the derived-record direction still feels right if the v2 bug/regression needs to be fixed before any v3 work starts.

[github-actions]

Coverage Report

Metric	Covered	Total	%
Instructions	3984	33584	12%
Branches	107	836	13%
Lines	629	4638	14%
Methods	164	880	19%
Classes	49	123	40%

Lowest-Coverage Packages

Package	Covered	Total	%
com.example.ironpath.data.local.dao	0	966	0%
com.example.ironpath.data.local	0	198	0%
com.example.ironpath.ui.theme	0	143	0%
com.example.ironpath.dev	0	138	0%
com.example.ironpath.ui.screens.devtools	0	124	0%
com.example.ironpath	0	106	0%
com.example.ironpath.ui.navigation	0	88	0%
com.example.ironpath.ui.screens.entry	0	77	0%
com.example.ironpath.ui.components	0	36	0%
com.example.ironpath.di	0	29	0%

Lowest-Coverage Files

File	Covered	Total	%
com/example/ironpath/ui/screens/plan/PlanScreen.kt	0	726	0%
com/example/ironpath/ui/screens/active/ActiveScreen.kt	0	405	0%
com/example/ironpath/ui/screens/history/HistoryScreen.kt	0	340	0%
com/example/ironpath/data/local/dao/SessionDao_Impl.kt	0	338	0%
com/example/ironpath/data/local/dao/PlanDao_Impl.kt	0	335	0%
com/example/ironpath/ui/screens/home/HomeScreen.kt	0	304	0%
com/example/ironpath/ui/screens/history/AddRecordScreen.kt	0	232	0%
com/example/ironpath/data/local/IronPathDatabase_Impl.kt	0	197	0%
com/example/ironpath/data/local/dao/RecordDao_Impl.kt	0	187	0%
com/example/ironpath/dev/DevToolsSeeder.kt	0	138	0%
com/example/ironpath/MainActivity.kt	0	99	0%
com/example/ironpath/ui/theme/Type.kt	0	97	0%
com/example/ironpath/data/local/dao/HistoryDao_Impl.kt	0	93	0%
com/example/ironpath/ui/screens/devtools/DevToolsScreen.kt	0	86	0%
com/example/ironpath/ui/navigation/IronPathNavHost.kt	0	80	0%
com/example/ironpath/ui/screens/entry/EntryScreen.kt	0	77	0%
com/example/ironpath/ui/screens/devtools/DevToolsViewModel.kt	0	38	0%
com/example/ironpath/ui/components/GreenGradientButton.kt	0	36	0%
com/example/ironpath/di/AppModule.kt	0	29	0%
com/example/ironpath/ui/theme/Theme.kt	0	26	0%

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