Migrate toolchain from npm/Node.js to Bun + NX (#78)

* Migrate toolchain from npm/Node.js to Bun + NX

Replace npm with Bun as package manager and backend runtime, add NX for
build caching and task orchestration. Switch from native bcrypt to
bcrypt-ts for cross-runtime compatibility. Fix Tailwind CSS v4 PostCSS
configuration.

- Bun as package manager and backend runtime (replaces npm + tsx)
- NX lightweight/inferred mode for cached build/lint/test/type-check
- bcrypt-ts (ESM-only) with Jest transform configuration
- Tailwind v4: @tailwindcss/postcss plugin, @import + @config directives
- Updated CI workflows, justfile, pre-commit hooks, and documentation


* Address PR review feedback from CodeRabbit and Copilot

- Fix nx.json type-check to depend on own build + dependency builds,
  ensuring Next.js generates .next/types/routes.d.ts before type-check
- Fix bcrypt-ts description in tech.md (not truly cross-runtime)


* fix(deps): remove express-async-errors (incompatible with Express 5)

Express 5 has built-in support for async error handling, making the
express-async-errors package unnecessary. Additionally, express-async-errors
requires express@^4.16.2 which conflicts with express@^5.1.0.

This fixes the peer dependency conflict:
- express-async-errors@3.1.1 requires express@^4.16.2 (peer dependency)
- Project uses express@^5.1.0

Co-Authored-By: Warp <agent@warp.dev>

* Replace ESLint + Prettier with Biome for linting and formatting

Single Rust-based tool replaces 8+ ESLint plugins and Prettier. Removes
all eslint-disable comments (76 in source, converted 5 to biome-ignore
where justified). Adds biome.json overrides for test/example files.


* Update project guidance and steering docs for Bun + Hono + Drizzle stack

Revise architecture direction: Bun runtime with Hono framework,
PostgreSQL with Drizzle ORM, Turborepo with Bun workspaces, bun:test
for testing, and Biome for linting/formatting.

* Update migration specs and tasks for Bun + Hono + Drizzle architecture

Revise design doc, requirements, and task breakdown to reflect the new
stack direction with Hono framework, PostgreSQL/Drizzle ORM, and
Bun-native tooling.

* Add reference to @AGENTS.md in CLAUDE.md

Signed-off-by: UncleSp1d3r <unclesp1d3r@evilbitlabs.io>

* Revise AGENTS.md for Bun + Hono + PostgreSQL/Drizzle stack

Align AI agent guidance with updated steering docs and MERN_GUIDANCE.md.
Replaces all MERN/Express/MongoDB/Jest references with the new stack
direction: Hono, Drizzle ORM, bun:test, Biome, Turborepo, and Vite.


* Add .claude.local.md to .gitignore

Signed-off-by: UncleSp1d3r <unclesp1d3r@evilbitlabs.io>

* fix(biome): disable formatter for auto-generated next-env.d.ts

The pre-commit hook was failing because Biome's formatter flagged
next-env.d.ts (double quotes vs single quotes). This file is
auto-generated by Next.js and should not be formatted. The linter
was already disabled for it; this adds the formatter exclusion.


---------

Signed-off-by: UncleSp1d3r <unclesp1d3r@evilbitlabs.io>
Co-authored-by: Warp Agent <agent@warp.dev>

Author: unclesp1d3r

.bun-version

@@ -0,0 +1 @@
+1.3.9

.github/workflows/ci.yml

@@ -15,17 +15,22 @@ jobs:
       DOCKER_HOST: unix:///var/run/docker.sock
     steps:
       - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version-file: '.bun-version'
 
       - uses: actions/setup-node@v5
         with:
           node-version-file: '.node-version'
-          cache: npm
 
       - name: Install just
         uses: extractions/setup-just@v1
 
       - name: Install dependencies
-        run: npm install
+        run: bun install
 
       - name: Verify Docker is available for Testcontainers
         run: |

.github/workflows/copilot-setup-steps.yml

@@ -13,25 +13,25 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version-file: '.bun-version'
+
       - uses: actions/setup-node@v5
         with:
           node-version-file: '.node-version'
-          cache: npm
 
       - name: Install just
         uses: extractions/setup-just@v1
 
-      - name: Install root dependencies
-        run: npm install
-
-      - name: Install workspace dependencies
-        run: npm install --workspaces
+      - name: Install dependencies
+        run: bun install
 
       - name: Build shared package
-        run: npm run build -w shared
+        run: bun run --filter '@hashhive/shared' build
 
       - name: Run type checking
-        run: npm run type-check --workspaces
+        run: bun run --filter '*' type-check
 
       - name: Verify Docker is available for Testcontainers
         run: |

.github/workflows/fix-failing-checks.yml

@@ -1,5 +1,6 @@
 # Dependencies
 node_modules/
+package-lock.json
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
@@ -44,3 +45,5 @@ temp/
 # Test results
 frontend/test-results/
 frontend/playwright-report/
+.nx/
+.claude.local.md