CANP-WP-0006 T03: read API

Search, versions, manifests, archives and the index, over HTTP.

The route shape is the decision worth recording. Package ids contain `/`, so
the obvious /packages/{id}/{version} is ambiguous under a greedy path
parameter. Rather than invent an HTTP-specific identifier, the routes speak the
format's own <registry>:<id>@<version> syntax and parse it — `:` and `@` are
both legal in a path segment, and each route keeps a distinct prefix so
greediness cannot swallow a neighbouring one. The API therefore exercises
section 3.2's reference notation instead of working around it.

A bare id present in more than one registry returns 409 with the candidates,
never a guess. 409 rather than 300 because the request is answerable once the
caller says which registry they meant. Omitting a version applies section
17.1's selector rules, so a prerelease is never chosen implicitly.

Validation is delegated to reference/, installed into the service environment
rather than reimplemented. One validator means the service and the CLI cannot
disagree about what a valid package is; a service accepting something the CLI
rejects would be the divergence this project exists to prevent. Importing it is
not changing it — reference/ stays the dependency-light conformance witness.

Storage keeps the format's distinctions: an immutable package version, its
files as content rather than parsed rows, and an index entry recording arrival.
Only reserved paths and manifest-referenced files are stored (section 2), and a
re-publish of identical content is accepted while different content under the
same id@version is a conflict (section 17).

Handles a real test-vs-production difference: SQLite autoincrements INTEGER
PRIMARY KEY only, never BIGINT, so the SQLite-backed tests could not insert a
row. BigInteger().with_variant(Integer, "sqlite") keeps BIGINT on PostgreSQL
while letting the tests exercise the same models and migration.

Verified live against a seeded store holding this repo's examples and four
helix-forge prompt packages. Service tests 11 -> 22.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bjefh8NUiEiahN4JLwoSKM

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 388925@bnt-lap001
Assistant-Session: 3507023f-e0fd-4a1e-9d90-a0d4217d1502

reference/canned_prompts_reference.egg-info/PKG-INFO

@@ -0,0 +1,6 @@
+Metadata-Version: 2.4
+Name: canned-prompts-reference
+Version: 0.1.0
+Summary: Tiny filesystem reference CLI for Canned Prompt Format v0.1
+Requires-Python: >=3.10
+Requires-Dist: PyYAML<7,>=6.0

reference/canned_prompts_reference.egg-info/SOURCES.txt

@@ -0,0 +1,10 @@
+README.md
+canned_prompts.py
+pyproject.toml
+canned_prompts_reference.egg-info/PKG-INFO
+canned_prompts_reference.egg-info/SOURCES.txt
+canned_prompts_reference.egg-info/dependency_links.txt
+canned_prompts_reference.egg-info/entry_points.txt
+canned_prompts_reference.egg-info/requires.txt
+canned_prompts_reference.egg-info/top_level.txt
+tests/test_canned_prompts.py

reference/canned_prompts_reference.egg-info/dependency_links.txt

@@ -0,0 +1 @@
+

reference/canned_prompts_reference.egg-info/entry_points.txt

@@ -0,0 +1,2 @@
+[console_scripts]
+canned-prompts = canned_prompts:main

reference/canned_prompts_reference.egg-info/requires.txt

@@ -0,0 +1 @@
+PyYAML<7,>=6.0

reference/canned_prompts_reference.egg-info/top_level.txt

@@ -0,0 +1 @@
+canned_prompts