feat(config)!: one ordering for configuration sources, and a bootstrap deny rule

$DSH_HOME/.env had just become an ordinary environment layer, which left the
harness resolving user-facing values from a flattened process.env that could
no longer say where a value came from. A key stored through the web page
stayed shadowed by an older key in the user's own .env. An endpoint could be
redirected by the project: the invoking directory's .env is materialized like
every other layer, and a base URL decides where a resolved API key is sent, so
a DEEPSEEK_BASE_URL written into a model-editable workspace would send the
user's credential — and the prompts carrying their code — to whatever host
that file named.

Give every user-facing value one ordering, with four kinds of source:

  explicit for this run     per-operation override, CLI argument
  > authored by deployment  --config / --config-replace
  > this launch's shell     inherited process environment
  > product-managed store   settings.yaml, .credentials.yaml
  > discovered file         $DSH_HOME/.env
  > defaults                schema default, shipped base, public default

The domains differ only in which tiers exist. The earlier split — credentials
ranking the environment over the managed file while settings ranked over the
environment — was inconsistent: the distinguishing fact is who authored the
source, not the domain.

packages/util/environment owns an immutable snapshot with per-layer
provenance. getFrom(name, sources) searches only the layers a caller names,
and omitting one is a refusal rather than a demotion: the adapters ask for
['process', 'user-env'], so no reordering can let a project file back into a
decision it was excluded from.

isBootstrapOnly rejects, before anything is materialized, any .env setting a
variable that governs how a process launches (PATH, SHELL, NODE_OPTIONS,
LD_PRELOAD), where code or model-visible instructions load from (the whole
DSH_* namespace, HOME, XDG_*), or how the network is reached (proxy and CA
variables). The namespace is denied wholesale so a switch added later cannot
become settable by being forgotten, and there is no opt-out.

verify-config-source-ownership keeps both rules: no unregistered process.env
read under packages/*/*/src (26 allowlisted with reasons), and no apiKey,
baseURL, or headers inlined from the environment in shipped Cordis config —
removing those inlines is what makes the deployment tier meaningful.

packages/web/web-search-deepseek/package.json

@@ -29,6 +29,7 @@
   "peerDependencies": {
     "@deepseek-ai/dsh-agent": "^0.0.1",
     "@deepseek-ai/dsh-credentials": "^0.0.1",
+    "@deepseek-ai/dsh-environment": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-session": "^0.0.1",
     "@deepseek-ai/dsh-web": "^0.0.1",
@@ -41,6 +42,7 @@
     "@deepseek-ai/dsh-agent": "workspace:^",
     "@deepseek-ai/dsh-credentials": "workspace:^",
     "@deepseek-ai/dsh-credentials-local": "workspace:^",
+    "@deepseek-ai/dsh-environment": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-session": "workspace:^",
     "@deepseek-ai/dsh-web": "workspace:^",

packages/web/web-search-deepseek/src/index.ts

@@ -9,6 +9,7 @@ import type { Context } from 'cordis'
 import z from 'schemastery'
 import type {} from '@deepseek-ai/dsh-agent'
 import { credentialRef } from '@deepseek-ai/dsh-credentials'
+import { environmentOf } from '@deepseek-ai/dsh-environment'
 import type {} from '@deepseek-ai/dsh-session'
 import type {} from '@deepseek-ai/dsh-web'
 import {
@@ -80,8 +81,10 @@ export function apply(ctx: Context, config: Config): void {
     resolveApiKey: async () => {
       const credentials = ctx.get('credentials')
       if (credentials !== undefined) return (await credentials.resolve(apiKeyEnv))?.value
-      const ambient = process.env[apiKeyEnv]
-      return ambient !== undefined && ambient.length > 0 ? ambient : undefined
+      // Without the seam the launching environment is the whole credential
+      // plane — but only that layer, never a discovered project file.
+      const inherited = environmentOf(ctx).getFrom(apiKeyEnv, ['process'])
+      return inherited !== undefined && inherited.value.length > 0 ? inherited.value : undefined
     },
     apiKeyEnv,
     baseURL: config.baseURL ?? DEEPSEEK_DEFAULT_BASE_URL,

packages/web/web-search-deepseek/tsconfig.json

@@ -8,6 +8,9 @@
     "src"
   ],
   "references": [
+    {
+      "path": "../../util/environment"
+    },
     {
       "path": "../../../vendor/cosmokit"
     },

packages/web/web-search-exa/package.json

@@ -27,6 +27,7 @@
   ],
   "license": "BSD-3-Clause",
   "peerDependencies": {
+    "@deepseek-ai/dsh-environment": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-web": "^0.0.1",
     "cordis": "^4.0.0-rc.7"
@@ -35,6 +36,7 @@
     "schemastery": "^3.18.0"
   },
   "devDependencies": {
+    "@deepseek-ai/dsh-environment": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-web": "workspace:^",
     "cordis": "^4.0.0-rc.7"

packages/web/web-search-exa/src/index.ts

@@ -9,6 +9,7 @@
  */
 
 import type { Context } from 'cordis'
+import { environmentOf } from '@deepseek-ai/dsh-environment'
 import z from 'schemastery'
 import type {} from '@deepseek-ai/dsh-web'
 import {
@@ -58,7 +59,10 @@ export const Config: z<Config> = z.object({
 /** Register the Exa search provider with `ctx.web`. */
 export function apply(ctx: Context, config: Config): void {
   ctx.web.registerSearchProvider(new ExaSearchProvider({
-    apiKey: config.apiKey ?? process.env.EXA_API_KEY ?? '',
+    // Only the launching shell and the user's own `.env` may name this key:
+    // a project directory can be written by the model, and a substituted key
+    // would route every request through an account someone else reads.
+    apiKey: config.apiKey ?? environmentOf(ctx).getFrom('EXA_API_KEY', ['process', 'user-env'])?.value ?? '',
     baseURL: config.baseURL ?? EXA_DEFAULT_BASE_URL,
     searchType: config.searchType ?? EXA_DEFAULT_SEARCH_TYPE,
     highlightsPerResult: config.highlightsPerResult ?? EXA_DEFAULT_HIGHLIGHTS_PER_RESULT,

packages/web/web-search-exa/tsconfig.json

@@ -8,6 +8,9 @@
     "src"
   ],
   "references": [
+    {
+      "path": "../../util/environment"
+    },
     {
       "path": "../../../vendor/cosmokit"
     },

packages/web/web-search-perplexity/package.json

@@ -27,6 +27,7 @@
   ],
   "license": "BSD-3-Clause",
   "peerDependencies": {
+    "@deepseek-ai/dsh-environment": "^0.0.1",
     "@deepseek-ai/dsh-invariants": "^0.0.1",
     "@deepseek-ai/dsh-web": "^0.0.1",
     "cordis": "^4.0.0-rc.7"
@@ -35,6 +36,7 @@
     "schemastery": "^3.18.0"
   },
   "devDependencies": {
+    "@deepseek-ai/dsh-environment": "workspace:^",
     "@deepseek-ai/dsh-invariants": "workspace:^",
     "@deepseek-ai/dsh-web": "workspace:^",
     "cordis": "^4.0.0-rc.7"

packages/web/web-search-perplexity/src/index.ts

@@ -8,6 +8,7 @@
  */
 
 import type { Context } from 'cordis'
+import { environmentOf } from '@deepseek-ai/dsh-environment'
 import z from 'schemastery'
 import type {} from '@deepseek-ai/dsh-web'
 import { PerplexitySearchProvider, PERPLEXITY_DEFAULT_BASE_URL, PERPLEXITY_DEFAULT_MAX_TOKENS, PERPLEXITY_DEFAULT_MODEL } from './provider.ts'
@@ -52,7 +53,10 @@ export const Config: z<Config> = z.object({
 /** Register the Perplexity search provider with `ctx.web`. */
 export function apply(ctx: Context, config: Config): void {
   ctx.web.registerSearchProvider(new PerplexitySearchProvider({
-    apiKey: config.apiKey ?? process.env.PERPLEXITY_API_KEY ?? '',
+    // Only the launching shell and the user's own `.env` may name this key:
+    // a project directory can be written by the model, and a substituted key
+    // would route every request through an account someone else reads.
+    apiKey: config.apiKey ?? environmentOf(ctx).getFrom('PERPLEXITY_API_KEY', ['process', 'user-env'])?.value ?? '',
     baseURL: config.baseURL ?? PERPLEXITY_DEFAULT_BASE_URL,
     model: config.model ?? PERPLEXITY_DEFAULT_MODEL,
     maxTokens: config.maxTokens ?? PERPLEXITY_DEFAULT_MAX_TOKENS,

packages/web/web-search-perplexity/tsconfig.json

@@ -8,6 +8,9 @@
     "src"
   ],
   "references": [
+    {
+      "path": "../../util/environment"
+    },
     {
       "path": "../../../vendor/cosmokit"
     },