docs: clarify feature directories may live outside the project root

[chelsealong]

Summary

Fixes #4738.

docs/reference/core.md described SPECIFY_FEATURE_DIRECTORY as selecting a feature directory "within" the resolved project, and docs/guides/monorepo.md said the same ("the feature within it"). This implies a containment rule that is not intended or enforced.

Verified against the actual resolver (scripts/bash/common.sh, get_feature_paths, lines ~191-215):

if [[ -n "${SPECIFY_FEATURE_DIRECTORY:-}" ]]; then
    feature_dir="$SPECIFY_FEATURE_DIRECTORY"
    # Normalize relative paths to absolute under repo root
    [[ "$feature_dir" != /* ]] && feature_dir="$repo_root/$feature_dir"

An absolute SPECIFY_FEATURE_DIRECTORY is used as-is — it can point anywhere on disk, including outside the project root. Only a relative path is resolved under the project root. scripts/python/common.py does the same. So "within the resolved project" was inaccurate: feature directories hold documentation artifacts (spec.md, plan.md, …) and may legitimately live outside the project root, while the project root itself still identifies the Spec Kit project and its command/configuration context.

Changes

• docs/reference/core.md: reworded the SPECIFY_FEATURE_DIRECTORY table row and the "Two resolution axes" callout to state that a relative path resolves under the project root, an absolute path is used as-is and may point outside it, and the default feature location (specs/) is a default, not a containment boundary.
• docs/guides/monorepo.md: reworded the equivalent "selects the feature within it" sentence to the same effect, keeping the existing pointer to the full reference doc.

This is documentation-only, as requested by the issue: no runtime behavior, containment enforcement, or script logic was changed.

Test plan

Docs-only change; no unit tests apply to these files (grep -rl "core.md\|monorepo.md" tests/ returns nothing).

Ran the repo's markdown lint locally to confirm no new issues were introduced:

$ npx --yes markdownlint-cli2 "docs/reference/core.md" "docs/guides/monorepo.md"
markdownlint-cli2 v0.23.3 (markdownlint v0.41.1)
Finding: docs/reference/core.md docs/guides/monorepo.md !.genreleases/
Linting: 2 files
Summary: 2 issues in 1 file
docs/reference/core.md:60 error MD028/no-blanks-blockquote Blank line inside blockquote
docs/reference/core.md:62 error MD028/no-blanks-blockquote Blank line inside blockquote

Confirmed these two MD028 findings are pre-existing on main (same output with git stash applied, unrelated blockquote formatting a few lines below my edit) — not introduced by this change.

AI disclosure

This PR was authored by an autonomous AI agent (Claude Code, model Claude Sonnet 5, running non-interactively/autonomously) on behalf of the repository owner. The agent read the issue, verified the containment claim against the current scripts/bash/common.sh/scripts/python/common.py resolver logic, and made the minimal documentation wording change described above.

🤖 Generated with Claude Code

[Copilot]

Copilot review overview

🟡 Changes recommended

Both pages must explicitly document that relative paths may also resolve outside the project root.

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Review effort: Balanced
Findings: 2

Open (2)

• Clarify that relative paths can resolve outside the project root · New
• Document that relative paths may resolve outside the project root · New

What changed in this PR

Clarifies that feature directories are not confined to the Spec Kit project root.

Changes:

• Documents external absolute feature paths.
• Separates project context from feature-document location.
• Still omits explicit external relative paths such as ../shared-feature.

File	Description
docs/​reference/​core.md	Updates feature-directory resolution documentation.
docs/​guides/​monorepo.md	Clarifies project and feature selection in monorepos.

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[chelsealong]

Posted on behalf of @chelsealong by Claude Code (model: Claude Sonnet 5, autonomous); comment fully AI-drafted.

Addressed both inline comments in ae3dda9: docs/reference/core.md and docs/guides/monorepo.md now state that a relative SPECIFY_FEATURE_DIRECTORY is joined to the project root without a containment check, so a value like ../shared-feature still resolves outside it — not just absolute paths. Verified against get_feature_paths in scripts/bash/common.sh (feature_dir="$repo_root/$feature_dir" with no normalization).