Revert "Add harness and index templates for agent workflow"

This reverts commit c50082771d.

INDEX.md

@@ -1,68 +0,0 @@
-# INDEX.md
-
-## Start Here
-1. Read `AGENTS.md`.
-2. Read `HARNESS.md`.
-3. Read `00_開発共通/開発時に共通の前提情報.txt`.
-4. Confirm task contract (Purpose/Target/Done).
-
-## Priority Map
-- Rules:
-  - `AGENTS.md`
-  - `HARNESS.md`
-- Shared context:
-  - `00_開発共通/開発時に共通の前提情報.txt`
-- Docs:
-  - `docs/` (specs, runbooks, decisions)
-- Source:
-  - project code directories
-- State:
-  - `state/tasks/` (task records)
-  - `tests/golden/` (regression dataset)
-
-## Work Sequence
-1. Clarify scope from task contract.
-2. Identify minimal files to read/edit.
-3. Implement in small reversible steps.
-4. Run verification (L1/L2/L3 as applicable).
-5. Record results in `state/tasks/<task_id>.md`.
-6. Update docs if behavior/spec changed.
-
-## Input Template for Agents
-Use this payload shape:
-- Purpose: ...
-- Target: ...
-- Done: ...
-- Constraints: ...
-- Relevant files:
-  - path/to/file1
-  - path/to/file2
-- Verification commands:
-  - cmd1
-  - cmd2
-
-## Prompt Budget Rules
-- Prefer path references over pasted code.
-- Provide excerpts only when necessary.
-- Keep assumptions explicit and short.
-- If token pressure increases, summarize and continue.
-
-## Verification Checklist
-- L1 static checks executed.
-- L2 focused tests executed.
-- L3 scenario/regression checks executed or justified.
-- Results captured with command + exit code + key logs.
-
-## Definition of Done
-- Requested behavior is implemented.
-- Verification evidence is recorded.
-- Docs/specs are updated if needed.
-- Open risks and next actions are explicitly listed.
-
-## Quick Commands (edit as needed)
-```powershell
-# Example placeholders
-# npm run lint
-# npm test
-# npm run build
-```