fix: invoke pnpm by absolute path in Makefile, fix target path

[bushidocodes]

Problem

The pnpm installer only adds $PNPM_HOME/bin to PATH via ~/.bashrc, which a non-interactive make recipe never sources. So every pnpm-dependent target (node, http-server, netlify, fkill, bats) failed calling bare pnpm:

make: pnpm: No such file or directory
make: *** [Makefile:40: ~/.local/share/pnpm/node] Error 127

Two underlying issues:

1. pnpm not on PATH in the recipe (the failure above).
2. Wrong target path — modern pnpm (v11) installs to ~/.local/share/pnpm/bin/pnpm, not ~/.local/share/pnpm/pnpm, so the target file was never created and make re-ran the installer on every invocation.

Fix

PNPM_HOME := $(HOME)/.local/share/pnpm
PNPM := PNPM_HOME=$(PNPM_HOME) PATH="$(PNPM_HOME)/bin:$$PATH" $(PNPM_HOME)/bin/pnpm

$(PNPM_HOME)/bin/pnpm:
	curl -fsSL https://get.pnpm.io/install.sh | sh -

~/.local/share/pnpm/node: $(PNPM_HOME)/bin/pnpm
	$(PNPM) env use --global lts
# ...http-server, netlify, fkill, bats likewise

Invokes the absolute pnpm binary with PNPM_HOME set and its global bin dir on PATH (pnpm refuses i -g if the global bin dir isn't on PATH).

Verification

Run in a fresh ubuntu:24.04 container against the new Makefile — previously-failing targets now succeed:

+ node 24.16.0   (pnpm env use --global lts)   EXIT=0
+ bats 1.13.0    (pnpm i -g bats)              EXIT=0

Found via the same container test that validated #39/#40/#41/#42.

Fixes #47

🤖 Generated with Claude Code