chore(gitignore): match nested target/ for all crates, not just the repo root

[hyperpolymath]

Summary

• The repo has 7 Rust crates besides the workspace root (affinescriptiser/, runtime/, distributions/rattlescript/, tools/affine-doc/, tools/affine-pkg/, tools/affinescript-dap/, tools/affinescript-lsp/). Each builds to its own sibling target/.
• The previous rule /target/ was anchored to the repo root and only caught one of the seven. git status was showing e.g. tools/affinescript-lsp/target/ as untracked across several sessions, one stray git add . away from committing ~100 MB of build output.
• Drop the leading slash so target/ matches anywhere — the standard Rust convention.

Why not unanchor the others too

Only the Rust target/ has the nested-crate problem. /_build/ stays anchored: there's exactly one OCaml dune build dir at the root, and an unanchored _build/ could over-match user code that happens to live in a directory called _build. Same reasoning for the other anchored entries.

Verification

After the fix, git check-ignore confirms the nested dirs are now ignored:

$ git check-ignore tools/affinescript-lsp/target/ runtime/target/ affinescriptiser/target/
tools/affinescript-lsp/target/
runtime/target/
affinescriptiser/target/

Test plan

• git check-ignore returns each nested target/ path
• CI: no behavioural change expected (this only affects what git status shows and what git add . accidentally stages)

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 40 issues detected

Severity	Count
🔴 Critical	12
🟠 High	16
🟡 Medium	12

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Stray AI.a2ml in root -- use 0-AI-MANIFEST.a2ml only",
    "type": "banned",
    "file": "AI.a2ml",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Superseded by 0-AI-MANIFEST.a2ml",
    "type": "banned",
    "file": "AI.djot",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "Issue in quality.yml",
    "type": "missing_workflow",
    "file": "quality.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in security-policy.yml",
    "type": "missing_workflow",
    "file": "security-policy.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "publish-jsr.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action denoland/setup-deno@v2 needs attention",
    "type": "unpinned_action",
    "file": "publish-jsr.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/example/smoke_driver.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/cli.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "TypeScript file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/mod.ts",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  }
]

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