fix: honor template overrides for tasks-template (#2278) (#2292)

* fix: honor template overrides for tasks-template (#2278)

- Add scripts/bash/setup-tasks.sh mirroring setup-plan.sh pattern
- Add scripts/powershell/setup-tasks.ps1 mirroring setup-plan.ps1 pattern
- Update tasks.md frontmatter to use dedicated setup-tasks scripts
- Resolve tasks template via override stack and emit path as TASKS_TEMPLATE in JSON output
- Reference resolved TASKS_TEMPLATE path in generate step instead of hardcoded path

* fix: remove stray EOF tokens from setup-tasks scripts

* fix: improve error messages for unresolved tasks-template

* test: update file inventory tests to include setup-tasks scripts

* fix: use Console::Error.WriteLine instead of Write-Error in setup-tasks.ps1

* fix: write prerequisite error messages to stderr in setup-tasks.ps1

* fix: validate tasks template is a file and normalize path in setup-tasks.ps1

* fix: improve tasks-template error message to mention full override stack

* test: add setup-tasks.sh to TestCopilotSkillsMode file inventory

* fix: skip feature-branch validation when feature.json pins FEATURE_DIR

* fix: correct override path in tasks-template error messages

* test: add integration tests for setup-tasks template resolution and branch validation

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* fix: correct fixture paths and add spec.md prerequisite checks

* fix: use correct .registry schema in preset priority test

* fix: remove stale aaa-preset block and duplicate comment in preset priority test

* fix: align preset directory names with registry IDs in priority test

---------

Co-authored-by: Nimraakram22 <nimra.akram123451@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

templates/commands/tasks.md

@@ -10,8 +10,8 @@ handoffs:
     prompt: Start the implementation in phases
     send: true
 scripts:
-  sh: scripts/bash/check-prerequisites.sh --json
-  ps: scripts/powershell/check-prerequisites.ps1 -Json
+  sh: scripts/bash/setup-tasks.sh --json
+  ps: scripts/powershell/setup-tasks.ps1 -Json
 ---
 
 ## User Input
@@ -58,7 +58,7 @@ You **MUST** consider the user input before proceeding (if not empty).
 
 ## Outline
 
-1. **Setup**: Run `{SCRIPT}` from repo root and parse FEATURE_DIR and AVAILABLE_DOCS list. All paths must be absolute. For single quotes in args like "I'm Groot", use escape syntax: e.g 'I'\''m Groot' (or double-quote if possible: "I'm Groot").
+1. **Setup**: Run `{SCRIPT}` from repo root and parse FEATURE_DIR, TASKS_TEMPLATE, and AVAILABLE_DOCS list. `FEATURE_DIR` and `TASKS_TEMPLATE` must be absolute paths when provided. `AVAILABLE_DOCS` is a list of document names/relative paths available under `FEATURE_DIR` (for example `research.md` or `contracts/`). For single quotes in args like "I'm Groot", use escape syntax: e.g 'I'\''m Groot' (or double-quote if possible: "I'm Groot").
 
 2. **Load design documents**: Read from FEATURE_DIR:
    - **Required**: plan.md (tech stack, libraries, structure), spec.md (user stories with priorities)
@@ -76,7 +76,7 @@ You **MUST** consider the user input before proceeding (if not empty).
    - Create parallel execution examples per user story
    - Validate task completeness (each user story has all needed tasks, independently testable)
 
-4. **Generate tasks.md**: Use `templates/tasks-template.md` as structure, fill with:
+4. **Generate tasks.md**: Read the tasks template from TASKS_TEMPLATE (from the JSON output above) and use it as structure. If TASKS_TEMPLATE is empty, fall back to `.specify/templates/tasks-template.md`. Fill with:
    - Correct feature name from plan.md
    - Phase 1: Setup tasks (project initialization)
    - Phase 2: Foundational tasks (blocking prerequisites for all user stories)