refactor(scripts): migrate git-export helper from Python to bun

replace the python git-export script with a bun-based TypeScript implementation and update skill installation to invoke it via bun. Update docker ignore rules and README references to point to git-export.ts for consistency across tooling and docs

Author: tmeckel

.dockerignore

@@ -3,6 +3,6 @@
 !skills.yaml
 !scripts/
 !scripts/entrypoint.sh
-!scripts/git-export.py
+!scripts/git-export.ts
 !scripts/convert-gemini.auth.ts
 !scripts/install-skills.ts

README.md

@@ -349,7 +349,7 @@ The build bundles these tools and skills:
 - Azure Foundry provider build output
 - OpenCode skills for `stop-slop`, `aleph`, and changelog automation
 
-The repository also includes `git-export.py`, a helper script that exports a single directory from
+The repository also includes `git-export.ts`, a Bun helper script that exports a single directory from
 a GitHub repository using a treeless, sparse clone workflow.
 
 ## Release Model
@@ -364,7 +364,7 @@ This repo publishes container images to GitHub Container Registry from version t
 
 - `Dockerfile`: Builds the OpenCode container image and installs providers, tools, and skills
 - `entrypoint.sh`: Loads shell environment and starts `opencode`
-- `git-export.py`: Sparse GitHub directory export helper
+- `git-export.ts`: Sparse GitHub directory export helper
 - `Makefile`: Convenience targets for local image build and cleanup
 - `.github/workflows/`: PR validation, release sync, and registry publishing workflows
 - `.mise.toml`: Local tool definitions for linting and validation utilities