Add complete Stripe billing integration to PodcastItLater

- Implement Biz.PodcastItLater.Billing with checkout sessions, billing
portal, webhook handling - Add subscription database schema: plan_tier,
stripe fields, period dates, stripe_events table - Three-tier pricing:
free (10/month), personal (/month, 50 articles), pro (9/month,
unlimited) - Usage tracking and enforcement with tier-based limits
- Full billing UI with plan display, usage stats, pricing cards,
upgrade buttons - Dashboard shows current tier with billing button -
Update Web.nix with Stripe environment variables - Fix POST redirects
to Stripe with 303 status code for CloudFront compatibility

Amp-Thread-ID:
https://ampcode.com/threads/T-c139e5b5-1901-4cd6-8030-5623bfe1df35
Co-authored-by: Amp <amp@ampcode.com>

1 files changed, 27 insertions, 3 deletions

diff --git a/AGENTS.md b/AGENTS.md
index e1f35f5..b39c1a1 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -343,14 +343,38 @@ task ready
 
 ## Build and Test Commands
 
-Build the task manager:
+### bild
+
+`bild` is the universal build tool. It can build and test everything in the repo.
+
+Examples:
+```bash
+bild --test Omni/Bild.hs         # Build and test a namespace
+bild --time 0 Omni/Cloud.nix     # Build with no timeout
+bild --plan Omni/Test.hs         # Analyze build without building
+```
+
+### run.sh
+
+`run.sh` is a convenience wrapper that builds (if needed) and runs a namespace.
+
+Examples:
 ```bash
-bild --time 0 Omni/Task.hs
+Omni/Ide/run.sh Omni/Task.hs     # Build and run task manager
+Omni/Ide/run.sh Biz/PodcastItLater/Web.py  # Build and run web server
 ```
 
+This script will:
+1. Check if the binary exists in `_/bin/`
+2. Build it if it doesn't exist (exits on build failure)
+3. Execute the binary with any additional arguments
+
+### Test Commands
+
 Run tests:
 ```bash
-task test
+task test                        # Run task manager tests
+bild --test Omni/Task.hs         # Build and test a namespace
 ```
 
 ## Integration with Git