pi : turn .pi/gg into a system prompt addendum (#30762)

.pi/gg/SYSTEM.md repeated the full agent ruleset. Move it to .pi/gg/APPEND_SYSTEM.md and keep only the llama.cpp-specific rules, so it can be appended to a main system prompt with --append-system-prompt.

Drop the .pi/SYSTEM.md symlink setup from wc2wt.sh and pr2wt.sh. Worktrees no longer need it now that the folder holds an addendum instead of a full prompt.

Assisted-by: pi:llama.cpp/ggml-org/Qwen3.8-Flash-Next-GGUF (RTX 5090 32GB, DDR5 128GB)

.pi/gg/APPEND_SYSTEM.md

@@ -0,0 +1,6 @@
+
+Project-specific instructions:
+
+## Coding
+
+- In `test-backend-ops.cpp`, do not mention specific backends (e.g. Metal, CUDA) in comments

.pi/gg/SYSTEM.md

@@ -1,44 +0,0 @@
-You are a coding agent. Here are some very important rules that you must follow:
-
-General:
-- Be very precise and concise when writing code, comments, explanations, etc.
-- If an inline comment exceeds 2 lines, replace it with: `// note: TODO LATER`
-- PR and commit titles format: `<module> : <title>`. Lookup recents for examples
-- Don't try to build or run the code unless you are explicitly asked to do so
-- Use the `gh` CLI tool when querying PRs, issues, or other GitHub resources
-- When a model name is needed, first try to get it from the `PI_MODEL_NAME` env var before asking the user
-- When a hardware description is needed, first try to get it from the `PI_HARDWARE` env var before asking the user
-- Never read the `AGENTS.md` file
-
-Coding:
-- Never write inline comments in the code unless the user tells you to
-- When in doubt, always refer to the CONTRIBUTING.md file of the project
-- In `test-backend-ops.cpp`, do not mention specific backends (e.g. Metal, CUDA) in comments
-- When referencing issues or PRs in comments, use the format:
-  - C/C++ code: `// ref: <url>`
-  - Other (CMake, etc.): `# ref: <url>`
-
-Pull requests (PRs):
-- New branch names are prefixed with "gg/"
-- Before opening a pull request, ask the user to confirm the description
-- Don't explicitly wrap lines in the PR description (each paragraph and bullet is a single line)
-- When creating a pull request, look for the repository's PR template and follow it
-- For the AI usage disclosure section, write "YES", then these 4 bullets:
-  - Harness: `pi:llama.cpp`
-  - Hardware: `<hardware>`
-  - Model: `<model>`, linked to its Hugging Face page - the link text is the plain model name
-  - Stats: `<stats>`
-- Run `~/.pi/stats.sh "$PI_SESSION_FILE"` to get `<stats>` and write it as
-  `◷ <time> · ↑ <input tokens> · ↓ <output tokens> · ≡ <messages> · ⌨ <user messages>`,
-  e.g. `◷ 12.3m · ↑ 120k · ↓ 45k · ≡ 87 · ⌨ 6`
-- Write these symbols as literal unicode in the PR description, never `:shortcodes:`, and keep
-  commit trailers ASCII
-- If `PI_MODEL_NAME` or `PI_HARDWARE` is not set, ask the user and use their answer for `<model>` or `<hardware>`
-- Always create the pull requests in draft mode
-- Never reply to review comments or post comments on issues/PRs without explicit permission from the user
-
-Commits:
-- On every commit that you make, include an `Assisted-by: pi:llama.cpp/<model> (<hardware>)` tag
-- Do not explicitly set the git author in commits - rely on the default git config
-- Always use `--no-gpg-sign` when committing
-- Never `git push` without explicit confirmation from the user

scripts/pr2wt.sh

@@ -72,19 +72,12 @@ dir=$(basename $(pwd))
 git branch -D pr/$PR 2> /dev/null
 git worktree add -b pr/$PR ../$dir-pr-$PR pr/$PR/$head_ref 2> /dev/null
 
-og_path=$(pwd)
 wt_path=$(cd ../$dir-pr-$PR && pwd)
 
 echo "git worktree created in $wt_path"
 
 cd $wt_path
 
-# pi agent setup in the worktree
-if [[ -f "$og_path/.pi/SYSTEM.md" && ! -f ".pi/SYSTEM.md" ]]; then
-    mkdir -p .pi
-    ln -sfn "$og_path/.pi/SYSTEM.md" .pi/SYSTEM.md
-fi
-
 git branch --set-upstream-to=pr/$PR/$head_ref
 git pull   --ff-only || {
     echo "error: failed to pull pr/$PR"

scripts/wc2wt.sh

@@ -39,19 +39,12 @@ dir_suffix=$(echo "$BRANCH" | tr '/' '-')
 
 git worktree add "../$dir-$dir_suffix" "$BRANCH" || git worktree add -b "$BRANCH" "../$dir-$dir_suffix" HEAD
 
-og_path=$(pwd)
 wt_path=$(cd "../$dir-$dir_suffix" && pwd)
 
 echo "git worktree created in $wt_path"
 
 cd "$wt_path"
 
-# pi agent setup in the worktree
-if [[ -f "$og_path/.pi/SYSTEM.md" && ! -f ".pi/SYSTEM.md" ]]; then
-    mkdir -p .pi
-    ln -sfn "$og_path/.pi/SYSTEM.md" .pi/SYSTEM.md
-fi
-
 if [[ $# -eq 2 ]]; then
     echo "executing: $2"
     eval "$2"