diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..f4c7245
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,40 @@
+# EditorConfig — https://editorconfig.org
+# Keeps whitespace consistent across editors and IDEs before
+# Prettier / rustfmt / ruff get a chance to run.
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+# Markdown: trailing spaces are significant (hard line-break).
+# Let Prettier handle wrapping; don't trim here.
+trim_trailing_whitespace = false
+
+[*.{yml,yaml}]
+indent_size = 2
+
+[*.{json,jsonc}]
+indent_size = 2
+
+[*.toml]
+indent_size = 4
+
+[Makefile]
+indent_style = tab
+
+[*.rs]
+# rustfmt handles Rust formatting; EditorConfig just sets the baseline.
+indent_size = 4
+
+[*.py]
+indent_size = 4
+
+[*.{cpp,cc,c,h,hpp}]
+indent_size = 4
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index c8ad60a..5e71cb6 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -1,22 +1,54 @@
-name: lint
+# The org-wide lint gate. Drop this file in as
+# .github/workflows/lint.yml and change nothing else.
+#
+# The five checks it publishes are exactly the five contexts the
+# org ruleset requires:
+#
+#   lint / actionlint
+#   lint / JSON validity
+#   lint / prettier
+#   lint / markdownlint
+#   lint / yamllint
+#
+# Those strings come from the job being called `lint` and calling a
+# reusable workflow - a check publishes as "<caller job> / <called job>".
+# Do NOT convert this to a matrix: a matrix publishes
+# "lint (actionlint)" instead and will not satisfy the ruleset.
+#
+# Also copy .prettierrc, .prettierignore, .markdownlint.jsonc and
+# .yamllint.yaml from nyuchi/.github into your repo root.
+
+name: Lint
 
 on:
   pull_request:
   push:
-    branches: [master]
-
-permissions:
-  contents: read
+    # Every default-branch name in the estate: `main` covers 68 repos,
+    # `master` covers siafudb-kuzu, `scaffold` covers shamwari-core,
+    # shamwari-gateway and shamwari-web. Drop a name and merging to that
+    # repo's default branch fires nothing, so the five contexts never
+    # land on the default-branch head - which is how `lint / prettier`
+    # stayed red in bundu-labs/.github from 2026-05-02 unnoticed.
+    #
+    # A list rather than a bare `push:`, because unfiltered push would
+    # run the gate on every feature-branch push in 74 repos and bill it
+    # twice per PR. Add a name here if a repo ever adopts a fourth.
+    branches: [main, master, scaffold]
+  # Required for repos whose ruleset uses a MERGE QUEUE: required checks
+  # must report on the gh-readonly-queue/** ref, and only merge_group
+  # produces that. Without it a queued PR stalls for the full
+  # check_response_timeout and nothing can ever land. Harmless where
+  # there is no queue, so it stays in the one identical caller.
+  merge_group:
+  workflow_dispatch:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+permissions:
+  contents: read
 
 jobs:
   lint:
     uses: nyuchi/.github/.github/workflows/reusable-lint.yml@main
-    with:
-      # .svelte is excluded — formatting it needs prettier-plugin-svelte,
-      # which the org's reusable-lint workflow does not install. Svelte
-      # files stay locally-formattable; CI lints the rest.
-      prettier-glob: "**/*.{md,mdx,json,jsonc,ts,css,mjs}"
diff --git a/.markdownlint-cli2.jsonc b/.markdownlint-cli2.jsonc
deleted file mode 100644
index 6f188b0..0000000
--- a/.markdownlint-cli2.jsonc
+++ /dev/null
@@ -1,13 +0,0 @@
-// markdownlint-cli2 config — paths in scope for this repo.
-{
-  "config": {
-    "extends": ".markdownlint.jsonc",
-  },
-  "globs": ["**/*.md", "**/*.mdx"],
-  "ignores": [
-    "node_modules/**",
-    "**/.svelte-kit/**",
-    "**/.vercel/**",
-    "build/**",
-  ],
-}
diff --git a/.markdownlint.jsonc b/.markdownlint.jsonc
index d411079..1a3974c 100644
--- a/.markdownlint.jsonc
+++ b/.markdownlint.jsonc
@@ -1,13 +1,39 @@
-// markdownlint-cli2 config — relaxed defaults that match nyuchi/.github.
+// markdownlint-cli2 config for nyuchi/.github.
+//
+// Relaxed defaults that accommodate:
+//   - Long prose lines in docs (we format for readability, not width)
+//   - Inline HTML in the org profile (<div align="center">)
+//   - Files that start with an HTML comment or a <div> instead of an H1
+//   - Fenced code blocks without a language tag
 //
 // See https://github.com/DavidAnson/markdownlint/blob/main/doc/Rules.md
 {
   "default": true,
+
+  // Line length — we wrap for readability, not at a fixed column.
   "MD013": false,
+
+  // Inline HTML — profile/README.md uses <div align="center"> for the
+  // landing-page layout and that's intentional.
   "MD033": false,
+
+  // First line must be a top-level heading — profile/README.md opens
+  // with an HTML comment, which is correct.
   "MD041": false,
+
+  // Fenced code blocks without a language — acceptable for output
+  // blocks and plain-text fences.
   "MD040": false,
+
+  // Duplicate headings are fine as long as they aren't siblings
+  // (e.g. "## Summary" appears in multiple docs; that's expected).
   "MD024": { "siblings_only": true },
+
+  // Unordered list indentation — 2 spaces, matching our house style.
   "MD007": { "indent": 2 },
-  "MD060": false,
+
+  // Table-column-style — re-enabled now that Prettier is in CI and
+  // auto-formats tables. Prettier's table output should satisfy
+  // MD060's "aligned" style.
+  "MD060": true,
 }
diff --git a/.prettierignore b/.prettierignore
index 6531a77..b8d69cf 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,5 +1,30 @@
-.svelte-kit
-build
-.vercel
-node_modules
+# Prettier ignore for nyuchi/.github.
+
+# Standard ignores
+node_modules/
+.git/
+
+# Files with structural meaning that Prettier would harm
+LICENSE
+CODEOWNERS
+CODEOWNERS.example
+.github/CODEOWNERS
+
+# YAML is handled by yamllint and actionlint, not Prettier — they have
+# stronger guarantees about GitHub Actions semantics that Prettier does
+# not understand (e.g. the `on:` truthy quirk).
+*.yml
+*.yaml
+
+# Governance documents are authored by the Founder as legal / formal
+# documents. Prettier's markdown formatter reflows numbered paragraphs
+# ("2.2 The company pursues...") after a list as loose list-item
+# continuations, which corrupts the document's structure. Hand-format
+# these files.
+profile/governance/
+
+# Lockfiles, generated output
+*-lock.json
+*-lock.yaml
 package-lock.json
+pnpm-lock.yaml
diff --git a/.prettierrc b/.prettierrc
index de42adf..333987c 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,7 +1,16 @@
 {
-  "semi": true,
-  "singleQuote": false,
+  "printWidth": 80,
+  "proseWrap": "preserve",
   "tabWidth": 2,
+  "useTabs": false,
+  "endOfLine": "lf",
   "trailingComma": "all",
-  "printWidth": 80
+  "overrides": [
+    {
+      "files": ["*.md", "*.mdx"],
+      "options": {
+        "embeddedLanguageFormatting": "off"
+      }
+    }
+  ]
 }
diff --git a/.yamllint.yaml b/.yamllint.yaml
index 744516b..61cc7b6 100644
--- a/.yamllint.yaml
+++ b/.yamllint.yaml
@@ -1,4 +1,9 @@
-# yamllint config — matches nyuchi/.github.
+# yamllint config for nyuchi/.github.
+#
+# Relaxed defaults that accommodate:
+#   - GitHub Actions workflows (which use `on:` — a YAML 1.1 boolean)
+#   - Long lines in shell heredocs and comment blocks inside workflows
+#   - Files without `---` document-start markers
 #
 # See https://yamllint.readthedocs.io/en/stable/configuration.html
 
@@ -6,31 +11,72 @@ extends: default
 
 ignore: |
   node_modules/
-  .svelte-kit/
-  .vercel/
-  build/
+  # Lockfiles are generated, not authored. .prettierignore already
+  # exempts them under "Lockfiles, generated output"; yamllint not doing
+  # the same was an oversight that only stayed hidden because this repo
+  # has no lockfile. pnpm writes registry deprecation notices verbatim
+  # into pnpm-lock.yaml, which routinely exceeds the 140-char limit and
+  # cannot be rewrapped without invalidating the lockfile.
+  pnpm-lock.yaml
+  package-lock.json
+  yarn.lock
+  **/pnpm-lock.yaml
+  **/package-lock.json
+  **/yarn.lock
+
+  # Rails fixtures are ERB TEMPLATES, not YAML documents. campfire's
+  # test/fixtures/users.yml opens with
+  #   <% password_digest = BCrypt::Password.create("secret123456") %>
+  # and only becomes valid YAML after Rails renders it, so yamllint
+  # reports a hard syntax error and always will. The ActionText fixtures
+  # alongside them are HTML blobs that tests assert on byte-for-byte, so
+  # rewrapping their long lines would be a test change, not a formatting
+  # change. Seven files in that repo are ERB-templated YAML; the others
+  # only parse because their ERB happens to sit inside quoted scalars,
+  # which is luck rather than correctness.
+  test/fixtures/
+  **/test/fixtures/
 
 rules:
+  # 140-char limit. Workflow files have legitimately long shell URLs
+  # (the actionlint download script, action references) and issue-
+  # template `about:` strings render as a single line in the picker,
+  # so wrapping them would change user-visible behaviour. 140 is
+  # tight enough to flag truly excessive lines without forcing
+  # awkward breaks on URLs. Strict CI fails on any violation.
   line-length:
     max: 140
     level: error
     allow-non-breakable-words: true
     allow-non-breakable-inline-mappings: true
 
+  # GitHub Actions uses `on:` as a key, which YAML 1.1 treats as a
+  # boolean. Disable the truthy check on keys to stop yamllint from
+  # rejecting every workflow.
   truthy:
     check-keys: false
     level: error
 
+  # We don't prefix YAML files with `---`.
   document-start: disable
 
+  # Be lenient about how many spaces follow `#` in comments.
   comments:
     min-spaces-from-content: 1
 
+  # Comments-indentation flags standalone comments that don't match the
+  # indent of surrounding content. Real-world configs use comments to
+  # delimit sections (long `# ----` separator banners) and to mark
+  # commented-out blocks at the level of the code they replace, neither
+  # of which fits the rule cleanly. Disabled.
   comments-indentation: disable
 
+  # GitHub issue forms have deeply nested lists and mappings.
   indentation:
     spaces: 2
     indent-sequences: consistent
 
+  # Stops a warning on the trailing-empty-line check for files that
+  # end cleanly with a single newline.
   empty-lines:
     max-end: 1