diff --git a/CLAUDE.md b/CLAUDE.md
index 7ce4912..d5fd05d 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -54,6 +54,7 @@ Consumer territories must apply per-call timeouts at instantiation OR rely on th
 - **Test environment:** Browser-dependent tests use `// @vitest-environment happy-dom` file-level comments.
 - **Identical build config:** All packages share the same `tsdown.config.ts` structure.
 - **No direct axios imports in dependent packages.** Route `AxiosResponse` / `AxiosRequestConfig` / sibling types through `fs-http`'s re-exports (e.g. `Parameters<ResponseMiddlewareFunc>[0]` for response types). Direct `import type {AxiosResponse} from 'axios'` breaks rolldown's `d.cts` emission on dual-bundle packages — caught during `fs-cached-adapter-store` scaffold 2026-05-13.
+- **No top-level side effects.** Every published package declares `"sideEffects": false` in its `package.json` so bundlers can tree-shake under deep imports. The factory + barrel pattern ensures this is structurally true — every package's `src/index.ts` is either a pure re-export or a file whose top-level statements are imports, type declarations, and `const`/`function` factory declarations. The manifest entry makes it explicit and bundler-actionable. Closes enforcement queue #70 (publint 0.3.21 Suggestion, fatal-promoted by `scripts/lint-pkg.mjs`).
 - **Transport-surface discipline.** Every `fs-http` transport method must inherit option-honoring from the `axios.create()` instance. Adding a new transport path that uses native `fetch` (or any non-axios transport) requires a deliberate audit against the full `HttpServiceOptions` matrix — `headers`, `withCredentials`, `withXSRFToken`, `smartCredentials`, `timeout`, plus the per-call `AxiosRequestConfig` override surface. The Library-Config-Honor Surface Audit (Sapper M3 + Surveyor M3, 2026-05-15) is the standing checklist. The pre-1.0 `streamRequest` function violated this rule on four axes (queue #22 streamRequest portion + queue #64 XSRF + Surveyor M3 F-1 headers + F-2 timeout) and was removed in 0.4.0 with zero realized consumer impact. If a future streaming use case emerges, the right design is either axios's `responseType: 'stream'` mode via the standard methods (inherits all options for free) or a deliberate `createStreamHttpService` factory designed against the option-honoring matrix from the start — not a re-add of an axios-bypassing transport.
 
 ### Internal Dependency Coordination
diff --git a/packages/adapter-store/package.json b/packages/adapter-store/package.json
index cfc0b00..080652a 100644
--- a/packages/adapter-store/package.json
+++ b/packages/adapter-store/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/cached-adapter-store/package.json b/packages/cached-adapter-store/package.json
index 0f57e47..a3e196e 100644
--- a/packages/cached-adapter-store/package.json
+++ b/packages/cached-adapter-store/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/dialog/package.json b/packages/dialog/package.json
index 89bc59c..6a09e2a 100644
--- a/packages/dialog/package.json
+++ b/packages/dialog/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/helpers/package.json b/packages/helpers/package.json
index 76b4918..152cf67 100644
--- a/packages/helpers/package.json
+++ b/packages/helpers/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/http/package.json b/packages/http/package.json
index 5364a78..d9d66ca 100644
--- a/packages/http/package.json
+++ b/packages/http/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/loading/package.json b/packages/loading/package.json
index 8948601..61d807a 100644
--- a/packages/loading/package.json
+++ b/packages/loading/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/router/package.json b/packages/router/package.json
index dde314f..654e50a 100644
--- a/packages/router/package.json
+++ b/packages/router/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/storage/package.json b/packages/storage/package.json
index 9655be7..9c28c4b 100644
--- a/packages/storage/package.json
+++ b/packages/storage/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/theme/package.json b/packages/theme/package.json
index a29ae49..6bb7791 100644
--- a/packages/theme/package.json
+++ b/packages/theme/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/toast/package.json b/packages/toast/package.json
index b1c2540..e54d379 100644
--- a/packages/toast/package.json
+++ b/packages/toast/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/packages/translation/package.json b/packages/translation/package.json
index c84758e..b9e45a4 100644
--- a/packages/translation/package.json
+++ b/packages/translation/package.json
@@ -13,6 +13,7 @@
         "dist"
     ],
     "type": "module",
+    "sideEffects": false,
     "main": "./dist/index.cjs",
     "module": "./dist/index.mjs",
     "types": "./dist/index.d.mts",
diff --git a/scripts/lint-pkg.mjs b/scripts/lint-pkg.mjs
index 1c1339f..b7828d0 100644
--- a/scripts/lint-pkg.mjs
+++ b/scripts/lint-pkg.mjs
@@ -4,13 +4,26 @@
 // 1. publint + attw — treats publint suggestions/warnings/errors as fatal.
 //    publint 0.3.18 CLI does not expose a flag to fail on suggestions
 //    (--strict only promotes warnings → errors). This wrapper fills that gap:
-//    it runs publint per workspace, captures stdout, and fails the gate if any
-//    package emits a "Suggestions:", "Warnings:", or "Errors:" block.
-//    attw --pack runs after publint per package and preserves its own exit code.
+//    it runs publint per workspace, captures stdout, strips ANSI SGR codes,
+//    and fails the gate if any package emits a "Suggestions:", "Warnings:", or
+//    "Errors:" block. attw --pack runs after publint per package and preserves
+//    its own exit code.
 //    Motivated by enforcement queue #33 and the PR #35 regression: publint
 //    suggestions about the "git+" URL prefix silently re-drifted across 10
 //    packages because the gate tolerated them.
 //
+//    ANSI invariance (enforcement queue #63): publint colors its block headers
+//    when it detects a color-capable environment (TTY or FORCE_COLOR). In CI,
+//    publint emitted ANSI-wrapped headers (e.g. "\x1b[1m\x1b[34mSuggestions:\x1b[39m\x1b[22m"),
+//    so PUBLINT_BLOCK_RE — anchored on a bare "Suggestions:" line — never matched
+//    and the gate silently no-op'd (false-NEGATIVE: a real Warning/Error block
+//    would have sailed through CI undetected). Verified against raw CI logs:
+//    the gate had been a no-op in CI since publint 0.3.21 landed 2026-05-11,
+//    while locally (plain-text, non-TTY) the regex matched and the gate fired
+//    correctly. Fix: spawn publint with NO_COLOR=1 AND strip residual ANSI from
+//    captured stdout before the regex match — belt-and-suspenders so the verdict
+//    is identical in every color environment (plain, TTY, FORCE_COLOR=1).
+//
 // 2. engines.node presence — closes enforcement queue #31 (drift-prevention
 //    gate, deployed 2026-05-12). Every workspace package.json AND the root
 //    package.json must declare a non-empty `engines.node` string. Value is NOT
@@ -27,6 +40,15 @@ import {join} from 'node:path';
 const PACKAGES_DIR = 'packages';
 const ROOT_MANIFEST = 'package.json';
 const PUBLINT_BLOCK_RE = /^(Suggestions|Warnings|Errors):$/m;
+// SGR / ANSI escape sequences (CSI ... final-byte). publint wraps its block
+// headers in these when color is enabled (CI default, FORCE_COLOR), which
+// otherwise defeats PUBLINT_BLOCK_RE's bare-line anchors. See header note,
+// enforcement queue #63.
+const ANSI_RE = new RegExp(`${String.fromCharCode(27)}\\[[0-9;]*[a-zA-Z]`, 'g');
+
+function stripAnsi(text) {
+    return text.replace(ANSI_RE, '');
+}
 
 function listPackageDirs() {
     return readdirSync(PACKAGES_DIR)
@@ -61,8 +83,14 @@ function checkEnginesNode(manifestPath, label) {
     return null;
 }
 
-function runCaptured(cmd, args, cwd) {
-    const result = spawnSync(cmd, args, {cwd, stdio: ['ignore', 'pipe', 'pipe'], encoding: 'utf8', shell: false});
+function runCaptured(cmd, args, cwd, extraEnv) {
+    const result = spawnSync(cmd, args, {
+        cwd,
+        stdio: ['ignore', 'pipe', 'pipe'],
+        encoding: 'utf8',
+        shell: false,
+        env: extraEnv ? {...process.env, ...extraEnv} : process.env,
+    });
     const stdout = result.stdout ?? '';
     const stderr = result.stderr ?? '';
     process.stdout.write(stdout);
@@ -95,8 +123,11 @@ function main() {
             process.stderr.write(`  ${enginesFailure}\n`);
         }
 
-        const publint = runCaptured('npx', ['publint', 'run'], dir);
-        const publintBlock = PUBLINT_BLOCK_RE.exec(publint.stdout);
+        // NO_COLOR=1 keeps publint's output plain regardless of runner color
+        // settings; stripAnsi defends against any residual SGR codes so the
+        // PUBLINT_BLOCK_RE verdict is identical in every environment (queue #63).
+        const publint = runCaptured('npx', ['publint', 'run'], dir, {NO_COLOR: '1'});
+        const publintBlock = PUBLINT_BLOCK_RE.exec(stripAnsi(publint.stdout));
         if (publint.status !== 0) {
             failures.push(`${name}: publint exited ${publint.status}`);
         } else if (publintBlock) {