chore: add AI agent instruction files

[pixelflips]

Description

Adds standardized AI agent instruction files to the Pine repo to enforce project conventions when using AI coding tools. These files provide upfront context on commit types, branch naming, build commands, component patterns, and boundaries — reducing manual corrections and wasted tokens.

Fixes DSS-25

Files added

File	Scope	Audience
AGENTS.md	Root	All AI tools — Cursor, GitHub Copilot, OpenAI Codex, Google Jules, Aider, VS Code, etc...
.claude/CLAUDE.md	Root	Claude Code — loaded automatically every session
.cursor/rules/pine-project.mdc	Always applied	Cursor IDE — project-wide conventions
.cursor/rules/pine-components.mdc	**/*.tsx only	Cursor IDE — Stencil component development patterns

What the files cover

1. Project structure — component layout, file conventions, pds- prefix, subcomponent nesting
2. Git workflow — branch naming, commit type-by-file rules, PR template usage, no ticket numbers
3. Build & test commands — Nx commands (npm run build.all, npm run test.all, npx nx run @pine-ds/core:test)
4. Component development — Stencil decorators, Shadow DOM, event naming, JSDoc consistency
5. Testing — spec/e2e test locations, coverage expectations
6. Documentation — JSDoc terminology matching, MDX/Storybook patterns
7. Boundaries — always sk first / never ignore guardrails to prevent destructive actions

Type of change

• This change requires a documentation update

How Has This Been Tested?

• tested manually

Test Configuration:

• Pine versions: 3.17.0
• OS: macOS
• Browsers: N/A
• Screen readers: N/A
• Misc: Validated Claude Code loads .claude/CLAUDE.md automatically. Verified Cursor applies .mdc rules with correct glob scoping.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing tests pass locally with my changes

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[QuintonJason]

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