Fix Home Manager module package default

[srid]

emanote.homeManagerModule now works without a manual package override, fixing the failure reported in #309. The flake-level Home Manager export supplies Emanote's own default package, while the reusable module keeps its plain pkgs.emanote default for non-flake imports.

The regression is covered by a Linux NixOS VM test flake under nix/home-manager-test. It imports emanote.homeManagerModule, enables the user service without setting services.emanote.package, waits for emanote.service, and confirms the local HTTP server responds. Vira builds this test flake directly and overrides its emanote input to the checked-out PR tree.

Notable details

• The root flake does not gain a Home Manager input.
• Home Manager is pinned only inside the standalone test flake and follows Emanote's nixpkgs.
• vira.hs now builds both the root flake and ./nix/home-manager-test.
• The Nix install docs now show package = ... as an optional override rather than a required workaround.

Verification

nix develop -c cabal build all
just fmt
nix build -L ./nix/home-manager-test --override-input emanote . --no-link

Closes #309.

Try it locally

nix build 'github:srid/emanote/fix-home-manager-module-vm-test?dir=nix/home-manager-test' \
  --override-input emanote github:srid/emanote/fix-home-manager-module-vm-test

Generated by /do on Codex (model gpt-5).

[srid]

Hickey/Lowy Analysis

#	Reviewer	Finding	Disposition
1	Hickey	Package default policy was fragmented between the generic Home Manager module and the flake export.	Fixed in 9292ab48: the flake wrapper now supplies the self-backed default with lib.mkDefault, while the generic module keeps its pkgs.emanote default.
2	Lowy	The package source leaked into the lower-level Home Manager module instead of staying at the flake boundary.	No separate change: this was subsumed by the Hickey fix in 9292ab48.

The resulting boundary is intentionally narrow: direct imports of nix/modules/home/emanote.nix keep the old nixpkgs-oriented behavior, while emanote.homeManagerModule carries the flake-specific package default needed by issue #309.

[srid]

/do Results

Step	Status	Duration	Verification
sync	passed	1s	git fetch ok; forge=github; noGit=false
research	passed	5m 46s	Issue #309 traced to nix/modules/home/emanote.nix defaulting to pkgs.emanote; planned self-backed module default plus Linux VM check.
branch	passed	4s	Created fix-home-manager-module-vm-test from origin/master.
implement	passed	13m 18s	Added self-backed homeManagerModule default, Linux VM check, and explicit root flake in vira.hs; VM check built successfully.
check	passed	43s	nix develop -c cabal build all passed.
docs	passed	26s	Updated Nix install docs and changelog.
fmt	passed	10s	just fmt passed.
commit	passed	57s	Created and pushed feature/docs commits.
hickey+lowy	passed	5m 25s	Fixed shared package-default boundary finding in 9292ab48; Lowy finding was subsumed by the same fix.
police	passed	3m 8s	Fixed missing release-check rationale comment; rules, fact-check, and elegance were clean afterward.
test	passed	6s	nix build -L .#checks.x86_64-linux.home-manager-module --no-link passed.
create-pr	passed	38s	Created draft PR #685 and posted Hickey/Lowy analysis.
ci	passed	3m 31s	vira ci passed; signed off vira/aarch64-darwin and vira/x86_64-linux.
evidence	passed	0s	No visible UI impact; PR evidence not required.
Total		36m 22s

Slowest step: implement at 13m 18s.

Process notes

The expensive part was iterating the VM service probe. Future NixOS VM tests like this should start with a bounded HTTP probe (curl --max-time) and an explicit user-systemd environment when checking user services from the test driver.