chore: remove BMAD framework files and IDE configuration artifacts

Clean up unused BMAD workflow, agent, and command files across all IDE
configurations (.agent, .clinerules, .cursor, .gemini, .github, .kilocode,
.opencode) and internal module files (_bmad/bmb, _bmad/bmm).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.opencode/skills/bmad-shard-doc/SKILL.md

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+---
+name: bmad-shard-doc
+description: 'Splits large markdown documents into smaller, organized files based on level 2 (default) sections. Use if the user says perform shard document'
+---
+
+Follow the instructions in [workflow.md](workflow.md).

.opencode/skills/bmad-shard-doc/bmad-skill-manifest.yaml

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+type: skill

.opencode/skills/bmad-shard-doc/workflow.md

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+# Shard Document
+
+**Goal:** Split large markdown documents into smaller, organized files based on level 2 sections using `npx @kayvan/markdown-tree-parser`.
+
+## CRITICAL RULES
+
+- MANDATORY: Execute ALL steps in the EXECUTION section IN EXACT ORDER
+- DO NOT skip steps or change the sequence
+- HALT immediately when halt-conditions are met
+- Each action within a step is a REQUIRED action to complete that step
+
+## EXECUTION
+
+### Step 1: Get Source Document
+
+- Ask user for the source document path if not provided already
+- Verify file exists and is accessible
+- Verify file is markdown format (.md extension)
+- If file not found or not markdown: HALT with error message
+
+### Step 2: Get Destination Folder
+
+- Determine default destination: same location as source file, folder named after source file without .md extension
+  - Example: `/path/to/architecture.md` --> `/path/to/architecture/`
+- Ask user for the destination folder path (`[y]` to confirm use of default: `[suggested-path]`, else enter a new path)
+- If user accepts default: use the suggested destination path
+- If user provides custom path: use the custom destination path
+- Verify destination folder exists or can be created
+- Check write permissions for destination
+- If permission denied: HALT with error message
+
+### Step 3: Execute Sharding
+
+- Inform user that sharding is beginning
+- Execute command: `npx @kayvan/markdown-tree-parser explode [source-document] [destination-folder]`
+- Capture command output and any errors
+- If command fails: HALT and display error to user
+
+### Step 4: Verify Output
+
+- Check that destination folder contains sharded files
+- Verify index.md was created in destination folder
+- Count the number of files created
+- If no files created: HALT with error message
+
+### Step 5: Report Completion
+
+- Display completion report to user including:
+  - Source document path and name
+  - Destination folder path
+  - Number of section files created
+  - Confirmation that index.md was created
+  - Any tool output or warnings
+- Inform user that sharding completed successfully
+
+### Step 6: Handle Original Document
+
+> **Critical:** Keeping both the original and sharded versions defeats the purpose of sharding and can cause confusion.
+
+Present user with options for the original document:
+
+> What would you like to do with the original document `[source-document-name]`?
+>
+> Options:
+> - `[d]` Delete - Remove the original (recommended - shards can always be recombined)
+> - `[m]` Move to archive - Move original to a backup/archive location
+> - `[k]` Keep - Leave original in place (NOT recommended - defeats sharding purpose)
+>
+> Your choice (d/m/k):
+
+#### If user selects `d` (delete)
+
+- Delete the original source document file
+- Confirm deletion to user: "Original document deleted: [source-document-path]"
+- Note: The document can be reconstructed from shards by concatenating all section files in order
+
+#### If user selects `m` (move)
+
+- Determine default archive location: same directory as source, in an `archive` subfolder
+  - Example: `/path/to/architecture.md` --> `/path/to/archive/architecture.md`
+- Ask: Archive location (`[y]` to use default: `[default-archive-path]`, or provide custom path)
+- If user accepts default: use default archive path
+- If user provides custom path: use custom archive path
+- Create archive directory if it does not exist
+- Move original document to archive location
+- Confirm move to user: "Original document moved to: [archive-path]"
+
+#### If user selects `k` (keep)
+
+- Display warning to user:
+  - Keeping both original and sharded versions is NOT recommended
+  - The discover_inputs protocol may load the wrong version
+  - Updates to one will not reflect in the other
+  - Duplicate content taking up space
+  - Consider deleting or archiving the original document
+- Confirm user choice: "Original document kept at: [source-document-path]"
+
+## HALT CONDITIONS
+
+- HALT if npx command fails or produces no output files