docs: establish Stackable product discovery brain

[arena-ai-coding-agent]

Summary

• add an Obsidian-compatible second brain for Stackable product discovery
• preserve requested skill outputs, including grilling, wayfinding, interview, copy, and design guidance
• record product decisions, Blacksmith research, UI source assessment, and a Wayfinder map

Notes

• no application code changes in this PR
• documents the agreed GitHub, CI provider, CLI/MCP, live PR-report, AI-authoring, and UI direction

Validation

• documentation-only change; verified repository working tree is clean

Summary by Sourcery

Establish a repository-local second brain to preserve Stackable product discovery knowledge, decisions, research, and planning context.

New Features:

• Add an Obsidian-compatible, repository-local knowledge base for Stackable product discovery, including product briefs, research, decisions, sessions, skills, and planning maps.

Enhancements:

• Capture Stackable’s product direction, constraints, integration boundaries, AI authoring principles, CI provider scope, and UI source guidance.
• Preserve requested discovery and design skill outputs alongside applied product-discovery operating rules.
• Record Blacksmith competitor research, UI source assessments, and the current product wayfinder with open questions and next actions.

Documentation:

• Document the Stackable product brief, decision log, research baseline, discovery session, UI guidance, and planning map.

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Summary by cubic

Establishes a repository-local, Obsidian-compatible “second brain” for Stackable. It captures the brief, decision log, research baseline, and a wayfinding map to set product direction without changing application code.

• Start at second-brain/README.md; review product/brief.md, product/decision-log.md, and wayfinder/stackable-product-map.md.
• Constraints for future work: v1 ships PR CI health, assisted CI/CD authoring, and org management on GitHub.com with GitHub Actions, CircleCI, and Buildkite; use a GitHub App for repos, OAuth for people, and CLI device flow; generate a deterministic PR-status visualization (SVG allowed) and keep one canonical PR comment with debounce rules; run webhook, reconciliation, render, and comment refresh work in Inngest; follow palette (purple/onyx/silver/black), Geist/Satoshi, Iconoir-only icons, and no keyboard image; prefer Watermelon UI components (see source-material/ui-sources.md).
• Required actions for later PRs: align changes to product/decision-log.md; replace any Lucide icons with Iconoir; do not store secrets in second-brain; keep raw skill outputs unedited under second-brain/skills/.

^{Written for commit e4655f1. Summary will update on new commits.}

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Reviewer's Guide

Adds an Obsidian-compatible "second brain" directory to capture Stackable product discovery: product brief, decision log, competitor research, discovery session notes, preserved skill outputs, UI source assessment, and a wayfinding map, with conventions for future updates and explicit product/design constraints.

File-Level Changes

Change	Details	Files
Introduce a repository-local, Obsidian-compatible second brain entrypoint and conventions for Stackable product discovery.	Add second-brain README describing purpose, key entry notes, and navigation links to product, wayfinder, skills, and session documents. Define conventions for decision recording, skill output storage, source-linking for research, and prohibitions on secrets in the vault.	second-brain/README.md
Capture the current Stackable product brief, constraints, and visualization requirements as durable documentation.	Document product intent, CI maintainability positioning, and requested capabilities for PR monitoring, AI-assisted CI/CD setup, and operations surfaces. Record explicit design constraints including palette, typography, icon set, component-source expectations, and constraints around SVG/visual usage. Specify requirements for a deterministic, API-backed PR status visualization and its acceptable SVG usage.	second-brain/product/brief.md
Establish a structured decision log for product, architecture, and operational choices, plus open questions.	List dated, confirmed decisions across product category, platform surfaces, GitHub/CI provider scope, AI-authoring authority, identity model, and data boundaries. Capture decisions on dashboard workspaces, risk signaling, PR reporting hierarchy direction, background processing stack, and visualization approach. Enumerate open decisions around repository focus, SCM boundaries, PR report update behavior, tenancy and security model, and real-time update strategy.	second-brain/product/decision-log.md
Record baseline competitive research on Blacksmith and articulate Stackable’s opportunity space.	Summarize Blacksmith’s apparent capabilities and positioning based on public docs. Identify Stackable’s differentiated opportunity as a CI maintenance control plane and outline key value propositions and comparison points. Note research scope limits and call out areas needing technical/API validation before committing architecture.	second-brain/product/research-blacksmith.md
Log the initial discovery session, including completed tasks and key interview findings.	Record which skills were run, what artifacts were created, and verification of missing Design.md. Capture interview answers about initial audience, MVP pillar expectations, GitHub and CI adapter scope, identity, AI authority, and PR report behavior. Document interface-level decisions for workspaces, AI review flow, validation strategy, and revert behavior, plus next steps for PR report hierarchy.	second-brain/sessions/2026-08-21-discovery.md
Preserve raw outputs from requested skills and discovery searches in a structured skills vault, with an index and operating rules.	Add raw text outputs for grill-me, wayfinder, interview-me, unslop, initial find-skills, and multiple find-* discovery queries, without modification. Create a skills index mapping each skill/search to its raw output file and codify operating rules for using skills and decision mapping. Explicitly note the absence of the requested Design.md and how to integrate it when available.	second-brain/skills/emil-design-eng.txt second-brain/skills/find-Emil-Kowalski.txt second-brain/skills/find-ci-cd-github-actions.txt second-brain/skills/find-code-review.txt second-brain/skills/find-minimalist-design.txt second-brain/skills/find-product-marketing.txt second-brain/skills/find-skills.txt second-brain/skills/find-unslop-writing.txt second-brain/skills/grill-me.txt second-brain/skills/index.md second-brain/skills/interview-me.txt second-brain/skills/unslop.txt second-brain/skills/wayfinder.txt
Document UI component and design source strategy and constraints for Stackable.	Designate Watermelon UI as the primary component and layout source, with Shoogle, ReactBits, Aceternity, and Canvas UI as conditional secondary sources. Clarify how to handle Lucide imports in third-party examples by replacing with Iconoir, and reiterate accessibility, licensing, and dependency checks. Record motion and copywriting guidelines derived from Emil Kowalski’s skills and unslop outputs, along with palette/typography/icon constraints and SVG rules.	second-brain/source-material/ui-sources.md
Create a wayfinding map to guide ongoing product discovery toward a complete MVP specification.	Describe the destination for the wayfinder as an implementation-ready MVP spec for the CI maintainability platform and CLI. Link to existing decisions and summarize what is already fixed versus in flux, including pillars, adapters, and async infrastructure. Enumerate current frontier questions, unspecified areas, and explicit out-of-scope items to guide future discovery sessions.	second-brain/wayfinder/stackable-product-map.md

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[kilo-code-bot]

SUGGESTION: Likely typo in the Watermelon registry URL — watermellon-registry has a double l, while the sibling link on line 10 uses watermelon-platform (single l) under the same WatermelonCorp org. This is probably meant to be watermelon-registry.

Suggested change

	- [Watermelon UI registry](https://github.com/WatermelonCorp/watermellon-registry)
	- [Watermelon UI registry](https://github.com/WatermelonCorp/watermelon-registry)

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Reply with @kilocode-bot fix it to have Kilo Code address this issue.

[kilo-code-bot]

Code Review Summary

Status: 1 Issue Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	0
SUGGESTION	1

Issue Details (click to expand)

SUGGESTION

File	Line	Issue
second-brain/source-material/ui-sources.md	9	Likely URL typo: watermellon-registry (double l) vs sibling watermelon-platform; probably should be watermelon-registry.

Files Reviewed (19 files)

• second-brain/README.md
• second-brain/product/brief.md
• second-brain/product/decision-log.md
• second-brain/product/research-blacksmith.md
• second-brain/sessions/2026-08-21-discovery.md
• second-brain/skills/emil-design-eng.txt
• second-brain/skills/find-Emil-Kowalski.txt
• second-brain/skills/find-ci-cd-github-actions.txt
• second-brain/skills/find-code-review.txt
• second-brain/skills/find-minimalist-design.txt
• second-brain/skills/find-product-marketing.txt
• second-brain/skills/find-skills.txt
• second-brain/skills/find-unslop-writing.txt
• second-brain/skills/grill-me.txt
• second-brain/skills/index.md
• second-brain/skills/interview-me.txt
• second-brain/skills/unslop.txt
• second-brain/skills/wayfinder.txt
• second-brain/source-material/ui-sources.md
• second-brain/wayfinder/stackable-product-map.md

No secrets/tokens, broken internal links, or code-level defects were found. This is a documentation-only PR; preserved raw skill-output files (including embedded /tmp paths and ANSI codes) are intentional per the stated skills/ convention.

Fix these issues in Kilo Cloud

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_{Reviewed by hy3:free · Input: 83.6K · Output: 8.1K · Cached: 287.6K}