chore: prep v0.2 hardening branch for signing material hygiene

[daniel-p-green]

Summary

• add *.key and *.pem to .gitignore
• prevent accidental commit of local private/public key material used during signing and verification work
• keep repository hygiene aligned with upcoming SkillVault v0.2 trust/signing workflow tasks

Why

SkillVault v0.2 includes signed artifact and trust UX improvements. This branch prep ensures local cryptographic key files stay out of version control before broader hardening changes land.

Testing

• git status --short --branch
• git push -u origin feature/skillvault-v0.2-hardening-env-prep
• verified only .gitignore changed in this PR

Summary by Sourcery

Chores:

• Ignore local private/public key files (e.g., *.key, *.pem) in version control to maintain signing material hygiene.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

.gitignore is updated to exclude common cryptographic key files, preventing accidental commits of signing-related material for the SkillVault v0.2 hardening work.

File-Level Changes

Change	Details	Files
Exclude cryptographic key material from version control via .gitignore updates.	Add ignore pattern for files with .key extension Add ignore pattern for files with .pem extension Align ignore rules with upcoming SkillVault v0.2 signing and trust workflow needs	.gitignore

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[sourcery-ai]

Hey - I've left some high level feedback:

• Ignoring all *.key and *.pem globally might be too broad and could hide legitimate committed materials (e.g., test fixtures); consider scoping these patterns to specific directories (like a local signing workspace) or using more specific filenames to avoid unintended ignores.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Ignoring all `*.key` and `*.pem` globally might be too broad and could hide legitimate committed materials (e.g., test fixtures); consider scoping these patterns to specific directories (like a local signing workspace) or using more specific filenames to avoid unintended ignores.

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[daniel-p-green]

Review note: This PR is a useful security hygiene prep (ignoring local key material), but it does not yet implement the scoped SkillVault v0.2 deliverables/acceptance criteria (US-001..US-006).\n\nTo satisfy the task scope, follow-up work should include: dogfooding harness + fixtures/reporting, stable error taxonomy with JSON output and remediation hints across commands, CLI UX and exit-code standardization, signed artifact verification flow docs/examples, determinism/performance checks, and documentation hardening.\n\nIf this PR is intentionally only env prep, please explicitly scope it as such and track the full v0.2 implementation in a separate PR with verification evidence.