refactor: restructured and condensed agent prompts and system instructions

- Refactored and condensed numerous system prompts, agent instructions, and tool documentation files across packages.
- Streamlined workflow rules, formatting constraints, and execution guidelines for improved clarity and brevity.
- Updated discovery rules, recommendation criteria, and syntax standards in prompt templates.

packages/coding-agent/src/discovery/builtin-rules/go-range-int.md

@@ -6,7 +6,7 @@ astCondition:
   - "for $I := 0; $I < $N; $I++ { $$$BODY }"
 ---
 
-Go 1.22 lets `for` range over an integer. A plain counting loop from `0` to `n` with step `1` reads better as `for i := range n` (or `for range n` when the index is unused).
+Go 1.22: `for` ranges integers. For `i := 0; i < n; i++`, prefer `for i := range n`; if index unused, `for range n`.
 
 ## Avoid
 
@@ -38,8 +38,8 @@ for range n {
 }
 ```
 
-## When it does not apply
+## Exceptions
 
-- Non-zero start, step other than `++`, or a descending loop (`for i := n - 1; i >= 0; i--`) — keep the explicit form.
-- The body reassigns the loop variable or depends on `i` surviving past the loop.
-- Requires Go 1.22+. If the module's `go` directive is older, keep the classic loop.
+- Keep explicit: non-zero start; step other than `++`; descending (`for i := n - 1; i >= 0; i--`).
+- Keep explicit if body reassigns loop variable or depends on `i` surviving past loop.
+- Requires Go 1.22+. If module `go` directive older, keep classic loop.