chore: scaffold M0 — repo structure, ADRs, dev environment, pre-merge checklist

.gitea/ISSUE_TEMPLATE/agent_proposal.md

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+---
+name: Agent proposal
+about: Propose a new specialized agent — required before any agent code is written
+labels: type:feature, area:agent
+---
+
+**Agent name**
+
+**Single clearly defined responsibility**
+<!-- What does this agent own, and — just as important — what does it explicitly NOT own? -->
+
+**Interface**
+<!-- What does it take as input, what does it return, what does it call -->
+
+**Does it ever perform write/destructive actions?**
+<!-- If yes: must go through the Execution Guard. Describe how. -->
+
+**Dependencies** (other agents, integrations, data sources):

.gitea/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something isn't working as expected
+labels: type:bug
+---
+
+**What happened**
+
+**What you expected**
+
+**Steps to reproduce**
+
+**Area** (backend / agent / integration / infra):

.gitea/ISSUE_TEMPLATE/epic.md

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+---
+name: Epic
+about: A larger body of work spanning multiple issues
+labels: type:epic
+---
+
+**Goal**
+
+**Roadmap version this belongs to**
+
+**Child issues**
+- [ ]
+
+**Acceptance criteria**

.gitea/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Propose new functionality
+labels: type:feature
+---
+
+**What problem does this solve**
+
+**Proposed approach**
+
+**Which milestone/roadmap version does this belong to** (see docs/roadmap/roadmap.md):
+
+**Area** (backend / agent / integration / infra):

.gitea/PULL_REQUEST_TEMPLATE.md

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+## What changed
+
+## Why
+
+## Docs updated?
+<!-- Which doc(s), or why none were needed -->
+
+## Tested how?
+<!-- Be specific: what did you actually run/click/check -->
+
+## Pre-merge checklist
+Ran through `docs/architecture/pre-merge-checklist.md`: yes / no