diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..1000955
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,19 @@
+# EditorConfig: https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+[*.{py,go,rs,java,kt}]
+indent_size = 4
+
+[Makefile]
+indent_style = tab
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..1f72383
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,23 @@
+# Normalize line endings to LF in the repository.
+* text=auto eol=lf
+
+# Treat known binary types explicitly so diffs and merges behave correctly.
+*.png  binary
+*.jpg  binary
+*.jpeg binary
+*.gif  binary
+*.ico  binary
+*.pdf  binary
+*.zip  binary
+*.tar  binary
+*.tar.gz binary
+*.tgz  binary
+*.gz   binary
+*.7z   binary
+*.woff binary
+*.woff2 binary
+*.ttf  binary
+*.eot  binary
+*.mp3  binary
+*.mp4  binary
+*.webm binary
diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
new file mode 100644
index 0000000..882b650
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -0,0 +1,30 @@
+name: Bug report
+description: Report a defect or unexpected behaviour
+title: "bug: "
+labels: ["bug", "triage"]
+body:
+  - type: textarea
+    id: summary
+    attributes: { label: Summary }
+    validations: { required: true }
+  - type: textarea
+    id: steps
+    attributes: { label: Steps to reproduce }
+    validations: { required: true }
+  - type: textarea
+    id: expected
+    attributes: { label: Expected behaviour }
+    validations: { required: true }
+  - type: textarea
+    id: actual
+    attributes: { label: Actual behaviour }
+    validations: { required: true }
+  - type: input
+    id: version
+    attributes: { label: Version / commit }
+  - type: textarea
+    id: environment
+    attributes: { label: Environment }
+  - type: textarea
+    id: logs
+    attributes: { label: Logs / output, render: shell }
diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
new file mode 100644
index 0000000..aa1434e
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Documentation
+    url: https://github.com/agent-matrix
+    about: Browse Agent-Matrix repositories and documentation.
+  - name: Security advisory
+    url: https://docs.github.com/en/code-security/security-advisories
+    about: Please report security issues privately. See SECURITY.md.
diff --git a/.github/ISSUE_TEMPLATE/feature_request.yml b/.github/ISSUE_TEMPLATE/feature_request.yml
new file mode 100644
index 0000000..9e3f745
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/feature_request.yml
@@ -0,0 +1,19 @@
+name: Feature request
+description: Propose a change or new capability
+title: "feat: "
+labels: ["enhancement", "triage"]
+body:
+  - type: textarea
+    id: problem
+    attributes: { label: Problem }
+    validations: { required: true }
+  - type: textarea
+    id: proposal
+    attributes: { label: Proposal }
+    validations: { required: true }
+  - type: textarea
+    id: alternatives
+    attributes: { label: Alternatives considered }
+  - type: textarea
+    id: impact
+    attributes: { label: Impact on the alive system }
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..484a954
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,29 @@
+## Summary
+
+## Type of change
+
+- [ ] feat
+- [ ] fix
+- [ ] chore
+- [ ] docs
+- [ ] refactor
+- [ ] test
+
+## Alive-system surface
+
+- [ ] Adds/updates a health endpoint or check
+- [ ] Adds/updates emitted or consumed events
+- [ ] Adds/updates governance metadata
+- [ ] Adds/updates economics metadata
+- [ ] None of the above
+
+## Test plan
+
+- [ ] Unit tests pass locally
+- [ ] Lint passes locally
+
+## Checklist
+
+- [ ] PR title follows Conventional Commits
+- [ ] `CHANGELOG.md` updated under Unreleased (if user-visible)
+- [ ] No secrets, credentials, or private endpoints committed
diff --git a/.matrix/README.md b/.matrix/README.md
new file mode 100644
index 0000000..a61ed7e
--- /dev/null
+++ b/.matrix/README.md
@@ -0,0 +1,5 @@
+# Agent-Matrix Alive-System Manifest
+
+- `repo.yml` — repo identity, role, governance, economics, maintenance
+- `health.yml` — health checks this repo exposes
+- `events.yml` — events this repo emits and consumes
diff --git a/.matrix/events.yml b/.matrix/events.yml
new file mode 100644
index 0000000..bdc7926
--- /dev/null
+++ b/.matrix/events.yml
@@ -0,0 +1,3 @@
+schema_version: "0.1"
+emitted: []
+consumed: []
diff --git a/.matrix/health.yml b/.matrix/health.yml
new file mode 100644
index 0000000..32c52aa
--- /dev/null
+++ b/.matrix/health.yml
@@ -0,0 +1,2 @@
+schema_version: "0.1"
+checks: []
diff --git a/.matrix/repo.yml b/.matrix/repo.yml
new file mode 100644
index 0000000..24ed16d
--- /dev/null
+++ b/.matrix/repo.yml
@@ -0,0 +1,18 @@
+schema_version: "0.1"
+repo:
+  owner: "agent-matrix"
+  name: "matrix-python-sdk"
+  full_name: "agent-matrix/matrix-python-sdk"
+  role: "sdk"
+alive: { participates: true, contracts_version: "0.2" }
+maintenance:
+  maintainer: "matrix-maintainer"
+  repair_enabled: true
+  repair_constraints: [pr_only, run_tests]
+governance:
+  risk_level: low
+  requires_approval: false
+  approver: "matrix-guardian"
+economics: { budget_aware: false, reporter: "matrix-treasury" }
+events: { emitted: [], consumed: [] }
+health: { type: "command", endpoint: "", command: "python -c 'import matrix_sdk'" }
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..1aec2a3
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,14 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Standardized repository governance files (SECURITY.md, CODE_OF_CONDUCT.md,
+  CODEOWNERS, .editorconfig, .gitattributes) as part of the Agent-Matrix
+  alive-system synchronization.
diff --git a/CODEOWNERS b/CODEOWNERS
new file mode 100644
index 0000000..50c91ec
--- /dev/null
+++ b/CODEOWNERS
@@ -0,0 +1,6 @@
+# Default owners for everything in the repo.
+# These users / teams are the default reviewers for all pull requests.
+#
+# See: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-security/customizing-your-repository/about-code-owners
+
+*       @agent-matrix/maintainers
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000..3bdb6d1
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,59 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment include:
+
+- Demonstrating empathy and kindness toward other people
+- Being respectful of differing opinions, viewpoints, and experiences
+- Giving and gracefully accepting constructive feedback
+- Accepting responsibility and apologizing to those affected by mistakes
+- Focusing on what is best for the overall community
+
+Examples of unacceptable behavior include:
+
+- The use of sexualized language or imagery, and unwelcome sexual attention
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information without their explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Project maintainers are responsible for clarifying and enforcing standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior they deem inappropriate, threatening, offensive, or
+harmful.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies
+when an individual is officially representing the community in public spaces.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the maintainers listed in `CODEOWNERS`. All complaints will be
+reviewed and investigated promptly and fairly.
+
+All project maintainers are obligated to respect the privacy and security of
+the reporter of any incident.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org/),
+version 2.1, available at
+<https://www.contributor-covenant.org/version/2/1/code_of_conduct.html>.
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..e8d10d4
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,35 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in this repository, please report it
+responsibly. Do **not** open a public issue.
+
+- Use GitHub's [private vulnerability reporting](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) on this repository.
+- Or email the maintainers listed in `CODEOWNERS`.
+
+We aim to acknowledge reports within 3 business days and provide a remediation
+timeline within 10 business days for accepted reports.
+
+## Supported Versions
+
+The latest minor release is supported with security fixes. Older versions are
+supported on a best-effort basis.
+
+## Scope
+
+In scope:
+
+- Source code in this repository
+- Build, test, and release workflows under `.github/workflows/`
+- Documented APIs, CLIs, manifests, and runtime artifacts produced by this repo
+
+Out of scope:
+
+- Third-party dependencies (please report upstream first)
+- Self-hosted misconfiguration of an operator's environment
+
+## Coordinated Disclosure
+
+This project follows coordinated disclosure. Please give maintainers a
+reasonable window to remediate before any public disclosure.