feat: Add foundational documentation for security, workflow, and project management

- Create SECURITY.md to outline security policies and practices.
- Establish WORKFLOW.md detailing the project lifecycle from planning to retrospective.
- Introduce decision log structure in decisions/README.md for tracking architecture decisions.
- Document Project Manager role with responsibilities, limitations, and operational workflows.
- Implement templates for ADRs, bugs, meetings, projects, retrospectives, RFCs, roadmaps, and sprints.
- Set up memory logs for architecture and company-wide lessons learned.
- Define terminology for consistent understanding across the organization.

decisions/README.md

@@ -0,0 +1,19 @@
+# Decision Log
+
+This is the actual Architecture Decision Record log for Local LLC. Policy on when/how to write
+one lives in [../DECISIONS.md](../DECISIONS.md); this file is just the index.
+
+Numbering is sequential and append-only — a rejected or superseded ADR keeps its number forever
+and is never deleted or reused.
+
+## Index
+
+| # | Title | Status | Date |
+|---|---|---|---|
+| — | *No decisions recorded yet — this company is pre-v0.1 operational.* | | |
+
+## Adding an entry
+
+1. Copy `templates/ADR.md` to `decisions/NNNN-short-title.md`, using the next sequential number.
+2. Open it as a PR per the process in `../DECISIONS.md`.
+3. Once accepted, add a row to the table above in the same PR.