feat(skills): add project-context-pack skill

Add a new engineering skill that creates or refreshes a bounded project
memory file to serve as a navigation map for repository exploration.

The skill follows a disciplined search procedure that:
- Uses fd/rg for inventory before broad file reads
- Classifies project type with evidence citations
- Reads selectively with per-file content caps
- Indexes via tree-sitter/LSP/rg before browsing source
- Caches results in .agent/project-context.md

References the skill in README.md, common/README.md, and
common/engineering/README.md.

README.md

@@ -19,4 +19,5 @@ A collection of agent skills (slash commands and behaviors) loaded into Steve Be
 - [forge-interaction](common/engineering/forge-interaction/SKILL.md) — Work safely with GitHub and Gitea repositories, issues, pull requests, releases, and remote forge state.
 - [forge-preferences](common/personal/forge-preferences/SKILL.md) — Apply Steve's personal or project-specific GitHub/Gitea forge preferences.
 - [grilling](common/productivity/grilling/SKILL.md) — Interview the user relentlessly about a plan or design.
+- [project-context-pack](common/engineering/project-context-pack/SKILL.md) — Build and refresh a bounded repo context memory file so agents use disciplined search instead of repeated browsing.
 - [research-engineering](common/deprecated/dsp-research-dispatcher/SKILL.md) — Route DSP hardware and software research-engineering requests to the best specialist workflow and return a unified, decision-ready output.

common/README.md

@@ -19,4 +19,5 @@ Skills that work in all CLI agents.
 - [forge-interaction](engineering/forge-interaction/SKILL.md) — Work safely with GitHub and Gitea repositories, issues, pull requests, releases, and remote forge state.
 - [forge-preferences](personal/forge-preferences/SKILL.md) — Apply Steve's personal or project-specific GitHub/Gitea forge preferences.
 - [grilling](productivity/grilling/SKILL.md) — Interview the user relentlessly about a plan or design.
+- [project-context-pack](engineering/project-context-pack/SKILL.md) — Build and refresh a bounded repo context memory file so agents use disciplined search instead of repeated browsing.
 - [research-engineering](deprecated/dsp-research-dispatcher/SKILL.md) — Route DSP hardware and software research-engineering requests to the best specialist workflow and return a unified, decision-ready output.

common/engineering/README.md

@@ -7,3 +7,4 @@ _None yet._
 ## Model-invoked
 
 - [forge-interaction](forge-interaction/SKILL.md) — Work safely with GitHub and Gitea repositories, issues, pull requests, releases, and remote forge state.
+- [project-context-pack](project-context-pack/SKILL.md) — Build and refresh a bounded repo context memory file so agents use disciplined search instead of repeated browsing.

common/engineering/project-context-pack/SKILL.md

@@ -0,0 +1,101 @@
+---
+name: project-context-pack
+description: Use when the user wants a bounded repo context pack, project map, codebase index, cached memory file, or fewer repeated codebase searches.
+---
+
+# Project Context Pack
+
+Create or refresh a bounded project memory file, then use it as the navigation map for the repo.
+
+## Target
+
+Default cache path: `.agent/project-context.md` at the project root.
+
+Use a user-named path when provided. If the user did not explicitly ask for a cache file, ask before the first write into the repo. Never write secrets, credentials, private keys, tokens, browser data, personal data, or raw `.env*` content into the cache.
+
+## Procedure
+
+1. **Root.** Prefer `git rev-parse --show-toplevel`; otherwise use `pwd`. Completion: the pack records the absolute root and current relative working directory.
+2. **Survey.** Use `fd` and `rg` first; fall back to `find` and `grep`. Respect ignore files by default. Exclude `.git`, dependency directories, build outputs, caches, generated files, binaries, and large artifacts. Completion: the pack has a bounded file inventory and top-level tree before broad file reads.
+3. **Classify.** Detect language, framework, package manager, build/test tools, docs, agent guidance, and likely entry points from filenames and small config reads. Completion: every project-type claim cites at least one file.
+4. **Read selectively.** Read only high-value files by default: README, agent guidance, package/build config, docs index, main entry points, and files directly relevant to the user's current request. Cap per-file and total content. Completion: every included file has a recorded reason.
+5. **Index before browsing.** For code questions, prefer tree-sitter or LSP when available. Otherwise use `rg` for definitions, exports, imports, routes, tests, commands, TODOs, and error strings. Completion: the pack has search or symbol notes before any broad source reading.
+6. **Cache.** Create or update the memory file with the template below. Completion: the file records timestamp, root, status, commands/searches used, files inspected, exclusions, and next navigation rules.
+7. **Reuse.** Before future exploration, read the cache first. If stale or insufficient, refresh the smallest relevant section instead of rebuilding everything. Completion: subsequent work uses the cache or explains why it was bypassed.
+
+## Navigation discipline
+
+- Do not wander file-by-file. Start with the cache, `fd`, `rg`, tree-sitter, or LSP.
+- Track inspected files in the memory file.
+- Prefer narrow searches over whole-file reads.
+- Prefer symbol outlines and matching snippets over full content.
+- Re-read a file only when it changed, the cache is stale, or exact details are needed.
+- Ask before full-content extraction, large scans, or sensitive-file inspection.
+
+## Useful command patterns
+
+```bash
+root=$(git rev-parse --show-toplevel 2>/dev/null || pwd)
+cd "$root"
+
+date -Iseconds
+
+# Inventory
+fd --type f --hidden --exclude .git 2>/dev/null || find . -type f -not -path './.git/*'
+tree -a -I '.git|node_modules|dist|build|target|.venv|__pycache__|vendor|coverage' -L 3
+
+# Project signals
+fd '^(README|AGENTS|CLAUDE|GEMINI|package.json|pyproject.toml|Cargo.toml|go.mod|Makefile|justfile|docker-compose.yml)$'
+
+# Search before reading
+rg -n "TODO|FIXME|HACK|XXX"
+rg -n "^(export |class |def |function |interface |type |trait |struct |enum )"
+rg -n "main\(|if __name__ == .__main__.|export default|module.exports"
+```
+
+## Memory file template
+
+```markdown
+# Project Context Pack
+
+Generated: <timestamp>
+Root: <absolute root>
+Working directory: <relative path>
+Status: <fresh|partial|stale>
+
+## Purpose
+<What this repo appears to do.>
+
+## Project type
+<Languages/frameworks/package managers and evidence.>
+
+## Structure
+<Bounded tree or directory summary.>
+
+## Important files
+- <path> — <why it matters>
+
+## Commands
+- Build: <command or unknown>
+- Test: <command or unknown>
+- Lint/typecheck: <command or unknown>
+- Run/dev: <command or unknown>
+
+## Entry points
+- <path or symbol> — <evidence>
+
+## Search and symbol notes
+<Useful rg/tree-sitter/LSP findings.>
+
+## Files inspected
+- <path> — <reason> — <freshness note>
+
+## Exclusions
+<Skipped directories, large files, generated files, secrets policy.>
+
+## Navigation rules for future agents
+<How to answer common questions in this repo without repeated browsing.>
+
+## Refresh notes
+<What to refresh next and what is likely stale.>
+```