chore(github): add issue and PR templates

Adds bug report, feature/task issue templates, and PR template following
the project's PR_GUIDELINES.md structure with conventional commit prefixes,
acceptance criteria, and architectural notes sections.

Author: Soushi888

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,32 @@
+---
+name: Bug report
+about: Something that does not behave as specified
+title: "fix: "
+labels: bug
+---
+
+## Why now
+
+<!-- What broke? What is the user-visible or agent-visible impact? -->
+
+## To reproduce
+
+1.
+2.
+3.
+
+## Expected behavior
+
+## Actual behavior
+
+## Context
+
+<!-- Holochain version, conductor config, number of agents, test environment if relevant -->
+
+## Acceptance criteria
+
+- [ ] Original / specified behavior now works
+
+## Related
+
+- Blocks / blocked by: #

.github/ISSUE_TEMPLATE/feature.md

@@ -0,0 +1,28 @@
+---
+name: Feature / Task
+about: New capability, zome function, or design work
+title: ""
+labels: ""
+---
+
+## Why now
+
+<!-- What triggered this? What is blocked or missing without it? -->
+
+## Scope
+
+**In scope:**
+**Out of scope:**
+
+## Acceptance criteria
+
+- [ ]
+
+## Architectural notes
+
+<!-- Design constraint, tradeoff, or decision that narrows the solution space. Delete if not relevant. -->
+
+## Related
+
+- Blocks / blocked by: #
+- See also: #

.github/pull_request_template.md

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+## Intent
+
+<!-- Why this change. What problem it solves or what capability it opens. -->
+
+## Changes
+
+<!-- Organized by concern, not by file. Prose or short bullets. -->
+
+## Decisions
+
+<!-- Tradeoffs made, alternatives rejected and why. Delete this section if no architectural choices were made. -->
+
+| Option | Rejected because |
+| ------ | ---------------- |
+
+## How to test
+
+<!-- Concrete steps a reviewer can run, or pointer to CI coverage. -->
+
+## Documentation
+
+<!-- List docs updated, or: "No documentation folder in this project." or "docs: none — <reason>" -->
+
+## Related
+
+- Closes: #
+- Depends on: #
+- Follow-up: #