Add test-first-loop template and Forge execution stability improvements

[fperegrinvs]

Summary

This PR introduces two feature sets across 13 commits:

1. test-first-loop bundled template

A new multi-phase Forge template that enforces a test-first development workflow with an AI review gate.

• Scaffold the template with template.json, schemas, hook scripts, and prompts
• Define a 6-phase workflow with completion criteria and AI review gate
• Add phase-view data loaders (forgeLoadPhaseView in src/services/tauri.ts) to read template phases.json and plan state.json
• Render phase rows with Material icons in the Forge UI via getForgePhaseIconUrl

2. Forge execution stability & project gate

Stability fixes to prevent ghost sessions and ensure deterministic UI state.

• Project-selection gate: Forge panel opens without a workspace but blocks all actions (template browsing, plan selection, execution) until a project is explicitly selected
• Deterministic task-row status: Single-source resolution — active runningInfo.taskId wins, then phase state, then plan state. Stale in_progress rows are demoted when another task is actively running
• Execution loop guard: Validates task IDs against knownTaskIds from the selected plan; stops execution cleanly when all tasks are exhausted instead of creating an extra session

Documentation & tests

• Updated docs/forge.md with phase metadata, icon resolution, execution guards, and project gate behavior
• Frontend regression tests for phase rendering and plan state
• Template hook tests for multi-phase initialization
• Rust multi-phase execution core regression tests
• Script unit tests for test-first-loop hooks

Key files

Area	Files
Template	src-tauri/resources/forge/templates/test-first-loop/
Phase loaders	src/services/tauri.ts, src/utils/forgePhaseIcons.ts
UI	src/features/forge/components/Forge.tsx
Execution hooks	src/features/forge/hooks/useForgeExecution.ts
Rust core	src-tauri/src/shared/forge_execute_core.rs
Sidebar gate	src/features/app/components/Sidebar.test.tsx
Docs	docs/forge.md, docs/codebase-map.md

Test plan

• test-first-loop template appears in bundled template list
• Phase icons render with correct Material icon URLs; invalid IDs fall back to file.svg
• Forge panel shows "Select a project first" when no workspace is active; all action controls are disabled
• Task-row status resolves deterministically (active running > phase state > plan state)
• Execution loop exits cleanly when all tasks exhausted — no extra session/thread created
• Run vitest and cargo test suites — no regressions

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