feat: add Bulletmind structured bullet skill

Add Bulletmind for scoped hierarchical bullet formatting with maintainer metadata, limitations, and source-only cleanup.

skills/bulletmind/EXAMPLES.md

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+# Bulletmind Output Reference
+
+## Example 1 - Topic: Climate Change
+
+- Climate Change
+  - Definition
+    - Long-term shift in global temperatures and weather patterns
+  - Causes
+    - Human activities
+      - Burning fossil fuels
+      - Deforestation
+      - Industrial emissions
+    - Natural factors (less dominant)
+      - Volcanic activity
+      - Solar variations
+  - Effects
+    - Rising global temperatures
+    - Melting glaciers and ice caps
+    - Sea level rise
+    - Extreme weather events
+  - Solutions
+    - Reduce carbon emissions
+    - Transition to renewable energy
+    - Reforestation
+    - Sustainable practices
+
+## Example 2 - Topic: Operating Systems
+
+- Operating System (OS)
+  - Definition
+    - Software that manages computer hardware and software resources and provides a platform and interface for applications to run.
+  - Core Functions
+    - Process management
+      - Handles execution of running programs
+    - Memory management
+      - Allocates and tracks memory usage
+    - File system management
+      - Organizes and stores data
+    - Device management
+      - Controls and coordinates hardware components
+  - Types
+    - Batch OS
+    - Time-sharing OS
+    - Distributed OS
+    - Real-time OS
+  - Examples
+    - Windows
+    - macOS
+    - Linux

skills/bulletmind/SKILL.md

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+---
+name: bulletmind
+description: "Convert input into clean, structured, hierarchical bullet points for summarization, note-taking, and structured thinking."
+category: writing
+risk: safe
+source: community
+date_added: "2026-04-21"
+author: tejasashinde
+tags:
+  - writing
+  - summarization
+  - note-taking
+  - formatting
+  - structured-output
+tools:
+  - claude
+  - cursor
+  - gemini
+  - codex
+---
+
+# Bulletmind
+
+When active, responses remain in hierarchical bullet format with no paragraphs, no prose blocks, no drift, and only structured bullet output.
+
+---
+
+## When to Use This Skill
+
+Transform input into a structured bullet hierarchy when the user asks for:
+
+- Bullet-only summaries of dense text, notes, explanations, articles, or webpages
+- Cleaned-up note-taking output with clear parent-child relationships
+- Structured study material that is easier to scan and memorize
+- Consistent formatting for messy or mixed bullet lists
+
+Use this skill to enforce:
+
+- No paragraphs or long prose
+- Only bullets with clean indentation
+
+This improves readability, memorization, and structured thinking for note-taking and review workflows.
+
+---
+
+## Mode
+
+Default mode: **full**. Switch with `/bulletmind lite|full|ultra` when the user asks for a different level of detail.
+
+---
+
+## Intensity
+
+| Level | Behavior                                                                                            |
+| ----- | --------------------------------------------------------------------------------------------------- |
+| lite  | clean hierarchical bullets, light restructuring, preserve sentence flow                             |
+| full  | default strict hierarchy, balanced compression, clear grouping + splitting                          |
+| ultra | deep hierarchical decomposition, aggressive splitting, high granularity, maximal structural clarity |
+
+---
+
+## Bullet Structure
+
+Use consistent indentation:
+- Top-level idea
+  - Sub-point
+    - Detail
+  - Sub-point
+- Next top-level idea
+  - Sub-point
+
+---
+
+## Rules
+
+- NO paragraphs
+- ONLY bullets `-`
+- ALWAYS hierarchical structure
+- GROUP related ideas under parent bullets
+- SPLIT long sentences into smaller bullets
+- KEEP meaning intact, no over-summarize
+- REMOVE filler words
+
+---
+
+## Formatting
+
+- Use `-` for all bullets
+- Indent: 2 spaces per level
+- Keep bullets short
+- One idea per line
+- No mixed symbols and no prose bridging lines
+
+---
+
+## Transformation Logic
+
+- Paragraph -> main ideas -> top bullets
+- Details -> nested bullets
+- Messy notes -> cleaned hierarchy
+- Existing bullets -> restructure + normalize depth
+- Short input -> still convert into bullet tree
+
+---
+
+## Compression Strategy
+
+- Remove filler words
+- Split complex sentences
+- Preserve key facts + relationships
+- Do NOT flatten structure
+- Prefer clarity over max compression
+
+---
+
+## When Not to Use This Skill
+
+- User requests paragraphs
+- Creative writing tasks such as stories or essays
+- Formats where bullets reduce clarity or violate the requested output format
+
+---
+
+## Output Rule
+
+When the skill is active, output:
+
+- Structured bullet hierarchy
+- No commentary or explanation
+
+## Limitations
+
+- Do not use for deliverables that require prose, narrative flow, or exact source quotation.
+- Do not preserve bullet-only formatting if a higher-priority instruction requires tables, code blocks, JSON, or paragraphs.
+- Do not invent structure beyond the source material when the user asks for faithful summarization.
+
+### Examples
+
+- Refer to `EXAMPLES.md` for output templates.
+
+---
+
+## Important Notes
+
+- Prefer clarity over strict compression
+- Avoid flattening everything into one level
+- Maintain a logical tree structure