Add bug, feature, and tracked follow-up issue forms

[aidangarske]

Adds GitHub issue forms so every new issue goes through a structured template.

• Bug report: summary, commit, target (Nuvoton NPCT75x, Nations NS350, fwTPM responder, spdm-emu, wolfTPM integration, host), SPDM mode, steps, expected/actual, logs. Label bug.
• Feature request: problem, proposal, spec references (DSP0274, DSP0277, DSP0275, TCG SPDM binding), acceptance criteria, area. Label enhancement.
• Tracked follow-up: context, origin, what is needed, blockers, acceptance criteria. Label todo, for work deferred from a PR, review, or scan.
• Blank issues are off; security reports go to a private advisory.

Each form applies its label automatically, so issues filter by label:bug, label:enhancement, and label:todo. The todo and P0–P3 priority labels already exist on the repo, and the current backlog (#19–#33) uses them.

[Copilot]

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Copilot review overview

Review effort: Lite
Findings: 2 · 1

Open (3)

• The Target dropdown includes Other, but there’s no field to capture what Other means. Since… · New
• For tracked follow-ups, Origin is key for traceability but isn't required. Consider adding… · New
• The Area field is optional, but it’s commonly needed for routing/triage. Consider making it… · New

What changed in this PR

Adds GitHub Issue Forms to enforce structured intake for bugs, feature requests, and tracked follow-ups, while disabling blank issues and routing security reports to private advisories.

Changes:

• Adds issue forms for bug reports, feature requests, and tracked follow-ups with auto-labeling.
• Disables blank issues and adds a security contact link to GitHub Security Advisories.

File	Description
.github/​ISSUE_TEMPLATE/​bug_report.yml	Introduces a structured bug report form with SPDM-specific fields and auto bug label.
.github/​ISSUE_TEMPLATE/​feature_request.yml	Adds a feature request form with proposal/spec/acceptance sections and auto enhancement label.
.github/​ISSUE_TEMPLATE/​todo.yml	Adds a tracked follow-up template for deferred work with auto todo label.
.github/​ISSUE_TEMPLATE/​config.yml	Disables blank issues and routes security reports to private advisories.

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