Lab: swamp repo upgrade replaces entire CLAUDE.md with generic template instead of merging

Description

Running swamp repo upgrade from 20260228.015056.0 to 20260305.174423.0 replaced a 359-line project-specific CLAUDE.md with a 33-line generic swamp boilerplate template, destroying all existing project documentation.

Steps to Reproduce

Have a repo with a customized CLAUDE.md containing project-specific documentation (architecture, commands, troubleshooting, etc.) alongside swamp sections
Run swamp repo upgrade
Observe that CLAUDE.md is completely overwritten with the generic swamp template

Expected Behavior

swamp repo upgrade should merge new swamp-specific content (rules, skills sections) into the existing CLAUDE.md, preserving all project-specific documentation.

Actual Behavior

The entire CLAUDE.md is replaced with a minimal generic template containing only swamp boilerplate (rules, skills, getting started, commands sections). All project-specific content is lost.

Environment

swamp version: upgraded from 20260228.015056.0 to 20260305.174423.0
OS: macOS (Darwin 25.3.0)
Tool: claude

Summary

This bug affects the repo upgrade logic that handles CLAUDE.md updates. The fix would involve detecting existing CLAUDE.md content and merging new swamp sections into it rather than performing a full file replacement. This could be done by identifying swamp-managed sections (e.g., via markers or known headings) and only updating those, leaving the rest of the file intact.

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Native OpenTelemetry tracing for swamp CLI internals

Claude Code should prefer extending swamp extensions over using external CLI tools

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Delete methods should return last known state data

Add smoke-test skill for extension models

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Recommend or manage lockfile strategy for extension model npm dependencies

Add macOS Keychain vault type

bug: Vault secret shell escaping incomplete — $(), semicolons, and pipes are interpreted

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feat: add support for Nix via a flake

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fix: collective validator error message omits drivers and datastores

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After today upgrade

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RangeError: Maximum call stack size exceeded when loading extension models with npm dependencies after upgrade to 20260317

Extension Zod schema incompatibility after upgrade to 20260312

Data garbage collection never fully removes expired data from disk

extension push --dry-run requires authentication unnecessarily

Typed context APIs to eliminate no-explicit-any in extension models

AWS extensions fail to load: missing _lib/aws.ts shared dependency

getContent() should resolve vault expressions for sensitive fields

getContent() should return parsed objects, not raw Uint8Array

Add context.readResource() to MethodContext for user extension models

Datastore lock: allow concurrent reads across different models

extension install should be an alias of extension pull

feat: Execution Driver Abstraction — Pluggable Isolation for Model Execution

Support --global-arg on model create

consider a libswamp

Running workflow should not block read-only operations

Update from 20260227 to 20260311 breaks existing model definitions (symlink + path-based type)

loadUserModels ignores --repo-dir, uses cwd instead

datastore lock release --force deadlocks on the stale lock it's trying to release

Datastore lock not released when interactive command fails in non-TTY context

vault put to 1Password stores empty password field

Leaderboard shows 0-event users whose profiles 404

Data instance name uniqueness is global across specs instead of per-spec

Audit timeline misses today's entries in UTC+ timezones

AI agent discoverability: reduce trial-and-error for CLI syntax

GlobalArguments CEL expressions fail when factory inputs are omitted — selective evaluation not working

Document factory pattern for model reuse in skills

Delete method uses identifier as data name instead of instance name

CLI method run ignores required arguments without .default()

Workflow run output mixes data, errors, and logs without clear separation — hard to find what actually executed

data.latest() in workflow step inputs resolved at workflow start, not at step execution time

Update method fails when globalArguments contain cross-model CEL expressions

fix: extension npm packages fail to resolve in compiled binary

swamp repo upgrade replaces entire CLAUDE.md with generic template instead of merging

Add drift detection to reconcile stored state against live cloud resources

Model inputs schema validated on all methods — delete fails requiring create-time inputs

Support wait-until-ready semantics for async resource provisioning

support pushing to organizations

Add data rename/move command for non-destructive refactoring

Schema mismatch warnings lack model context and misrepresent API response shapes

Support pre-flight validate method on models before method execution

Extension models need built-in support for idempotent create operations

Workflow reports succeeded when step outputs indicate failure

Swamp skills don't prevent AI agents from manually generating UUIDs for workflows

Bundler breaks tslib CJS/ESM interop for @aws-sdk/client-s3 dynamic imports

Support both US and UK English spellings (-ize/-ise)

swamp extensions aren't rebundled all the time

forEach with object items and static step name causes spurious cyclic dependency error

Validate extension content namespaces match package namespace during push

Extension metadata should align with usage and show all information